Who on earth would rely on a game engine in bankruptcy? Would you get support? Would you get product keys? Would backend services get turned off? Who would collect revenues and would the terms change again? I think Unity has already done itself irreparable damage and if it ends in bankruptcy then blame the outgoing CEO. Engines need a constant conveyor belt of new games to sustain their revenues and I don’t see this happening. If the company is bought it will just be to pick the bones of a dead platform, collecting revenues from games out in the wild.
And yes there is pain and a learning curve to moving to other engines though I think most programmers would be able to cope with change and if they’re that incurious and inflexible that they can’t then maybe it’s time to find new programmers. I expect most teams will jump to another engine at a natural break in the development process, e.g. after completing a game and moving onto the next and they might start on a smaller project and work up to familiarise themselves with their new tools.
As for Godot, I am sure it is not a 100% feature for feature replacement for Unity. But it sure as hell is capable of powering 95% of indie games out there no trouble whatsoever and I daresay some more challenging titles. Another compelling reason for devs to reevaluate their relationship with Unity.