That's not a real argument. It's the same fallacy as saying "who could we replace Moyes/Martinez/<Insert Manager Here> with - you find a way and move on. If Bolasie was a top tier player like Messi, yeah you'd have a point, but he's not.
As for "form/ability in the past 12 months" - Bolasie hasn't had that either, and you can't compare the form of any other winger because they quite simply haven't been played in the same way Bolasie has; in a system set up to get him the ball.
I genuinely would prefer Deulofeu and Mirallas to Bolasie, and honestly in a different system I'd prefer Lennon - I think we can set up more effectively than hoofball to a crap winger and start not playing like the donkeys we've been in recent months.
He won't be a miss, because we'll change the way we play and bring better players to fit a system in January and the summer. And even if he was a key player, which he really isn't, he would have been out for over a month anyway soon and we've already blown any chance of achieving anything notable in the league anyway, so we may as well take this time to rebuild.
Deulofeu and Mirallas have been here over 2 years each and contributed basically zip! Nice sentiment thinking changing the system will make them better, but they have been crap in Roberto's side and crap in this side when given a chance.
Bolaise has contributed more in his first 13 games than these two jesters in the last 2 seasons.
it's all about opinions of course, but Mirallas has turned out to be a massive dud and the other is basically a prancing show pony who has been bombed out wherever he has played apart from Spain U21's.
I hope they make me eat my words of course, but they won't.