That Reddit will not shut down. It will take the hit and go on and probably make at least some money. Only, it will be a much different place, more like Facebook or Instagram, in that it will be full of ads and less specific information.
It will cease to be a different, often niche space and become just another, more generalized social for a more generalized public.
In short: we, aka the people who migrated, simply are not their intended target anymore.
Who cares? I actually think that even though this is ultimately a bad decision on Reddit's part, they are well within their right to make it.
I guess I'm not the intended audience of reddit anymore, but all I am is someone that wants to have a conversation with other people on the internet without getting interrupted by ads, while using a client that I like. I even was willing to pay money for this, and I did pay for the pro relay app, but since reddit is breaking compatibility with it, it is time to move on to the fediverse. I want to have more ownership of my content anyway, and I am an IT engineer anyway, so it is time to make that happen. Self host my own instance and participate on other instances.