Let's see...

FFXIV is so incredibly popular that the company had to stop selling the game, DURING THE HOLIDAYS, because their servers were overloaded.

Seems to me like the whole idea of "improving PvP would be good to bring in more players" is completely unnecessary, considering they can barely handle the players they have that are focused on PvE.

Plus, I'm personally grateful that this game isn't trying to cater more to PvP. In my experience, PvP usually results in the following:
- Creates more unneeded animosity between players
- Causes a ton more balancing issues between classes/jobs
- Requires a fair amount of time/energy/resources (that I would prefer going into making other improvements to the game)