It might be interesting to look at what's happened with some of the new TLDs. One DNS provider, which is usually known for somewhat discounted rates, is asking $2399.95 per year to renew .car and .auto TLDs. Source: https://www.domainmonger.com/register-domain/. You can see that renewal prices vary all over the place depending on TLD, with prices presumably marked up from the wholesale price the TLD registry owner decides to charge.
I'm sure Ethos Capital is looking at numbers like that and salivating. Their primary goal will be to recoup their $1.1 billion then maximize profits. If not-so-rich .org's have to drop their domain names because they can't afford renewals, so be it, as long as enough richer .org's make up for it at the peak of the profit vs price curve.
I think Ethos has promised to limit price increases to 10% per year for the first few years as an incentive for the deal to go through, there's no telling what will happen after that. Even 10% is far faster than inflation. And shouldn't prices be going down? Just what work is involved in maintaining a database with 10 million .org records, which (as I understand it) is mostly kept updated with automated feeds from DNS service providers?
(BTW I wonder what PIR's plan is for the $1.1 billion they'll get.)