The ACA marketplace is damaged and taking new hits...but it's not a high risk pool and probably won't be

Update, 3/8/18: Various analyses are now predicting steeper premium hikes and coverage losses than I anticipated here, resulting from the combined effects of mandate repeal and greenlighting of short-term and AHP plans. See Urban Institute, 2/26, and Covered California, 3/8.
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Since it first hit email boxes a few months (or maybe a year-plus?) ago, Vitals, Axios' healthcare e-newsletter, has beguiled its way into a first read. Editor Sam Baker, and Axios generally, have taken the holy grail (or shibboleth) of contemporary prose, concision, to a new level, sating our short attention spans while salting news aggregation with interpretation.  I find the trademark "be smart" tagline a touch patronizing, but the substance of that signposted takeaway is nearly always on point.

That said, I'm going to quibble with today's lead storylette, with a point behind the quibble that goes beyond Axios, I think.

The news item is HHS's proposed rule to allow loosely regulated short-term health plans to be sold for terms as long as a year rather than three months, the limit that went into effect last April. Since short-term plans are cheap, medically underwritten and not bound to cover Essential Health Benefits, they are poised to attract healthier buyers. With this rule, Trump's HHS punches one more hole in the ACA risk pool

Here's my quibble. According to Sam Baker, The ACA-compliant individual market is "sliding deeper into something a lot more like a makeshift high-risk pool, in which healthy people are absent and the government simply pays to cover sick people." I think that's overstated.

The marketplace isn't all roses for the subsidized, either

Sam Baker has an insightful take on the bifurcation of the individual market between the subsidized and the unsubsidized, exacerbated by Trump. I want to offer a caveat, though.

Of the fallout from Trump's cutoff of Cost Sharing Reduction (CSR) reimbursement -- premium spikes for the unsubsidized, bronze and gold bargains for some subsidized -- Baker writes:

All of this has compressed the ACA's benefits. The law was initially designed to move a lot of people into the same system, in which even the people who didn't get a subsidy would benefit from a competitive marketplace to shop for coverage.

Instead, we're ending up in a place where the poorest consumers can get even cheaper coverage than the ACA intended, especially if they choose less comprehensive care, while wealthier consumers increasingly don't have much incentive to get covered at all. Those trends will only grow more pronounced if Republicans successfully repeal the individual mandate in their tax bill, leaving the law with only its carrot, and no stick.

There's nothing inaccurate here. But in general discourse if not here, the perceived bonanza for the subsidized stemming from inflated subsidies may be somewhat overstated.

If you like your ACA plan, you very likely won't be renewing anyway

Sam Baker and  Jonathan Cohn have both spotlighted a Milliman briefing paper warning of an important potential glitch looming as the ACA's second Open Season approaches. It's this: while the government is encouraging current customers to renew their current plans via auto-enrollment, many customers may see significant price spikes if the plan they selected last year loses its status as a "benchmark" plan.

Subsidies are keyed to the second cheapest silver plan in each market, deemed the benchmark; subsidized customers who buy a plan more expensive than the benchmark have to pay the whole difference. Thus, if the ACA affordability formula decrees that you should pay $30 per month for a benchmark plan with a base premium of $300, and that plan's premium spikes to $350 and it cedes its benchmark status, you'll now be on the hook for $80 per month rather than $30 if you stick with it. To stay at roughly the $30 level, you'll have to switch to one of the two cheapest silver plans on offer this year. (Additionally, if the benchmark plan price goes up, customers' advanced premiums may also go up if they re-apply rather than auto-enroll.)

I wouldn't dream of downplaying this very important potential glitch. But I think it's worth noting an often-unnoticed market factor that will mitigate its impact somewhat: there's tremendous churn in the individual market, and it's likely that half or more of those who enrolled in private plans in 2014 will be looking to renew. Many will have found jobs that offer insurance; some will become eligible for Medicaid; some will marry or move and need to select a new plan in any case. In November 2013, healthcare scholars Rick Curtis and John Graves estimated (with some caveats) that just 42 percent of Americans eligible for subsidized exchange coverage at end of 2014 (i.e., the upcoming open enrollment season) were eligible in the prior year. That doesn't quite tell us what percentage of those currently enrolled in subsidized exchange plans will not be seeking coverage for 2015, but it gives an idea of the degree of turnover.