>unlikely scenario that 4chan(nel) ever gets shut down
It's not THAT unlikely. All the other social media websites have either died (too many to count) or transformed into something entirely unrecognizable from when they launched (twitter, youtube, most recently reddit).
4chan won't shut down their servers, but they could well become victim to their financial troubles, changing legal culpability for the site owners, FBI surveillance measures, or the consequences of unspeakable crimes committed by userbase, or it may simply be completely overtaken by AI actors. Then 4chan would transform into something unrecognizable. They may have to implement incredibly strict moderation, or real ID verification, or it might have to reshuffle the boards and drop /mlp/. These scenarios have happened before on other websites and will happen again. It's not super unlikely that 4chan will be the victim.