Senpai is definitely going to be disappointed that the club she left him consists of only one art person and a bunch of gyarus using it as a hangout location. Hopefully this will make MC grow as a character and make FMC jealous and finally realize that the longer she waits the more chance of him being stolen will be.
@Valanway they probably don't have club activities (apart from him going to the clubroom to draw). As for being recognized, third years are probably still members, sure they're ghost members but they still count for the minimum numbers.