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.

Halfway back to the future in the individual market for health insurance

The ACA-compliant individual market for health insurance is at a mid-point between Trump sabotage that's been executed and Trump sabotage that's threatened. At present, the market remains viable for most subsidized prospective enrollees -- and even accidentally improved for a good number of them via discounts for bronze and gold plans. It's largely dysfunctional for the unsubsidized, however, after two years of average premium hikes in excess of 20%.

The main (though by no means only) act of sabotage in 2017 was Trump's long-running threat -- executed in October -- to cut off federal reimbursement that the federal government is legally obligated to pay insurers for providing Cost Sharing Reduction (CSR) payments to qualifying enrollees. Stiffed by Trump, insurers had to boost premiums to cover the cost of CSR. That in itself accounted for nearly half of this year's 29% average premium hike, according to Charles Gaba.

The next sabotage threat is individual mandate repeal, coupled with pending administrative action to empower a non-ACA-compliant market of medically underwritten, loosely regulated plans. -- which currently do not satisfy the mandate. Those measures in combination will trigger a fresh wave of premium hikes in the ACA-compliant market by draining its risk pool. Many if not most of the 6-7 million current unsubsidized enrollees in ACA-compliant plans will probably be driven perforce into the unregulated market if this next round of sabotage is fully implemented.

We are already halfway there, I suspect.  Recently I spotlighted the choice facing a 58 year-old in Pottsville, PA who's ineligible for subsidies -- that is, with an income over $47,520 for an individual or $64,080 for a couple. For this person