Not too late, they can move to reinstate them any time.
Yes, they can so move. It will probably take them a couple of months to do it. In a large automated bureaucracy, everything takes months.
Sure, they could but why on earth would they? Insurers now have no incentive to offer non-compliant plans now that Obamacare has given them the green light to offer nothing but expensive, comprehensive plans to everyone.
And who is going to pay millions of dollars for the work that was done to remove those plans first, and then to reinstate them? It's not just the CEO scribbling a few plans on a napkin - it takes a lot of human labor to cancel plans of tens of millions and offer them something else that would be their best option. Just USPS costs of 50 million envelopes would be about 20 million dollars, not even counting the contents. And then there will be replies, so you need to man the phones... It's a lot of money that had been already spent (wasted,) and insurance companies, contrary to democratic beliefs, aren't made of money. In the end the customer always pays for everything. Those old plans and old prices aren't coming back; they were possible only when the system was running smoothly.