We can blame the "end game" mentality for that. Luckily MSQ is major turn off for players that I call "the spacebar nation" (skip everything story related and rush to max level).

I am interested in the application of 4.0 myself. It will either start at level 60 which brings us the problem of gap between 50-60. Or it will start at level 50 which brings us the issue of current players. I am not sure that playerbase would be happy with doing low level content for which they are way overgeared. Of course you can level sync it, but neither I think many would be happy with glamour only gear.

But who knows? As it is assumed to take place underwater it might require different type of gear and maybe even different jobs. It would be interesting if our current jobs got an underwater specialization with its own levels post 50.