+1
I did remember thinking something similar, but more about regular network shows. Binge-y things come out in bunches, and naturally they might start production later for next season (or maybe not much, since they go into production after a lot of writing and story-breaking stuff is done, which is stuff that's probably still happening through quarantine). But network shows might only be a handful of episodes ahead of whatever's airing, so anything that wasn't almost already done might have to shut down production just before a season finale, for example.
But yeah, if this stretches on for months, there will be a "running out" of some shows. There's a lot of stuff out there that can be used, still, and I imagine a lot of people are scrambling to do so. Extra footage, stuff people were sitting on until they had time and room to use it properly, etc. That, and I've just got a huge backlog of shows and movies to catch up on, anyway, without new ones coming out! Shouldn't be a problem.