OTOH, taking away someone's beloved app, hitting them with big usability downgrade... that's not just principle, and they could lose those users.
But then there's some where the mods and other highly active users are a more active part in making it what it is. Think subs with weekly book clubs, or game challenges, or what not organised by the mods. Is Reddit going to get staff for all these niches to deliver the same level of experience? Probably not.
Most of the casual users I know use Reddit for a few small meme subreddits and topics that are too small for their main-platforms. If those are down, Reddit is dead to them.
(Of course Reddit could try to send their staff each down a different rabbit hole to fit them into the communities. This would be fucking hilarious. I hope this doesn't happen but if it happens, I'll have my popcorn ready.)
Admins? There aren't enough.