Sigh another Fanboy battle... More games doesn't always mean better games. Lemme give you an example. I really like Nintendo but I prefer Final Fantasy on the PS3 because it's from the original serie, not a spin-off like it's going to be on Wii (a.k.a. FF: Crystal Chronicles) Of course Nintendo is getting more support but, it doesn't mean the games are better than the other consoles.
You're right more doesn't mean better. But for some of us, if it looks like Console X is getting more games I want than Console Y, why should I still pick Console X? Of course I'm only speaking for myself, but as of right now, for the games I want the Wii is getting far more games I am interested in than either of the other 2 consoles.
After the disappointment of XII, I've already decided that for me the main FF series has gone to hell. :-/ I actually have higher hopes for FFCC:TCB than I do FFXIII, if they can capture the feel of the SNES Final Fantasy games in FFCC:TCB, I'll buy whatever they make for that series. :)
And also, Final Fantasy Crystal Chronicles is technically "not" a spin-off any more than Final Fantasy Tactics, which I personally hold in higher regard over any main FF game ever. Technically, Final Fantasy XII : Revenant Wings would be more of a spinoff. Like it or not, it is it's own game series.