Well of course at first we'll get at least ten threads up every day. But it should last only for the first two weeks of airing.
After that it depend how the anime is.
If it has something unexpected, like superpowers or cute girls or actual BL, maybe people will keep watching it.
If it seems like a totally normal sports anime with cute boys, then a lot of people will drop it out of boredom and lack of things to troll.
If it's only moe and no substance, well we'll probably have people dropping and people who keep watching for the sole purpose of trolling.
Either way we should be careful of making as less threads as possible. And no generals, this would be even worse. Never ever make general threads.