FFX would translate just fine to the Wiimote. Battles use 3 buttons primarily (confirm, cancel, and switch out the party members), the wiimote has three buttons all within easy thumb reach of the wiimote. Out of battle, FFX uses 2 buttons (talk and menu), again easy for the wiimote. Then there's the directional pad, which admittedly with the wiimote alone it would be awkward. If only there was a very common extension that ran from the wiimote via a cord, almost like a nunchuck if one will, and had a means of directing movement without motion...
Combined, the wiimote and chuck are a beautiful gaming pair, far nicer to hold in one's hand than the bat’leth like PS2 controller. It is very true that there are fewer button options, but in turn very few games make full regular use of the buttons available. Personally, I am also quite hopeful about the Wii Motion Plus add-on. That really should have been incorporated in the controller from the get-go, but the possibilities are beautiful.
Also, to note, Nintendo DID provide 2 controllers (though I would object to the use of the motion sensors to be gimmicky, any more than multiple buttons are gimmicky). The other is called the Classic Controller. And let’s not forget that the Gamecube controllers are compatible with the system as well.