I can't see business travel making a comeback in any serious way for a long time, if at all. Not only have we seen companies move to video conferencing pretty much scores the board, but working from home is now being made a permanent thing for many firms too. There won't even be offices to travel between in alot of cases!
Economy class will likely fare better as people will still want to travel for leisure and will be budget conscious now more than ever. Of course many use business class for their personal travels too, but is that market enough to prop up the Airlines that rely on the forward cabin being busy?