This has already been in discussion and already has a base in Frontlines PVP (sometimes you go in with less than 72 ppl). They said that some older content/dungeons ect. would possibly become soloable as less people queue for them. Scaling the amount of monsters, and HP is already in the game as well for FATES, so I'm sure they could incorporate it for dungeons or old Raids like CT ........ I'm sure this will eventually come.