If I were guessing, we'll see at least 100 more episodes probably around May. Even on the streaming side there's still enough of the traditional TV mentality that "add new things in February" probably isn't a coincidence relative to that month's importance under the linear tv ratings format. Also gives the current batch a few cycles to run through plus it does take time to get the episodes converted and screened.
If they keep adding on, eventually the number of episodes is going to get too unwieldy. There's 168 hours per week, so right now it takes them 8 1/3 days to run every episode they have. My *guess* is that somewhere no greater than 400, possibly less, they're going to start culling episodes from the front end of the run assuming they stick to their currently "all the episodes, looped" model. "Everything from 1982" as the first cull point gets rid of 76 shows from their rotation, keeps the Plinko debut, keeps everything from calendar year 1983, gets rid of everything with the old turntable, and gets rid of those early September/October '82 eps that have been seen BY FAR more than anything else on the channel so far, but assuming they keep adding new episodes, I think we're still a little way from that point. If the Fall '82 shows are still in rotation past the end of Cycle 4 (at which point we'd be a couple months into Fall '84) I'll be surprised unless the way the channel is scheduled changes.
Although in theory there's no reason they'd *have* to drop anything, beyond "storage capacity in the playout server".