I play both FFXI and WoW, and plan to make time for FFXIV as well. I also have a full time job and waste a great deal of my free time @#%^ing around on the internet, so I would like to let people know that it is very possible.
Try fitting a relationship with a non-gamer girl/guy in there and let me know if it's still "very possible" ahah. I used to date a gamer girl and I could play games whenever I wanted without feeling like I was ignoring her, she would play her own MMO too, but now I'm with someone else who doesn't play a lot of video games and I'd rather spend time with her and make sure I pay attention to her, I miss my gaming time a lot though heh, but I still get a chance to log in once in a while. I don't have enough free time to play a new/another MMO, it would be a waste of money.
I'm with the majority of people here, I've invested too much time in FFXI to just start another MMO. My computer wouldn't handle it anyway, and I can't afford a new machine right now. If it is as solo-friendly as WoW I might consider it, but again, I would need a new computer.
I think FFXIV will be a game for those (mostly FF fans I'm guessing) who weren't really playing MMO's and can just pick it up as a first game, or for those who have plenty of time. Knowing me I'll probably read forums and drool over pictures ; ;