Is it at all possible to implement both control types? I found that the Secret Files games (at least on the Wii) done a pretty good job of allowing the player to use either just the Wii remote or the Nunchuck and Remote combo.
Personally I would have though that this sort of arrangement makes everyone happy.
I understand the desire for first person controls - especially on a console; it arguably makes it more immersive and the control scheme is more conventional to modern gamers. That being said I think that the first person controls end up alienating many of the traditional adventure audience.
Admittedly I haven't tried out W&G yet - this is predominantly because of the systems they are currently on; I don't have an Xbox and W&G doesn't motivate me enough to use bootcamp. Monkey Island however is a different matter entirely and will happily buy both versions - but my finger did waver on the purchase button due to concern about controls. Monkey Island 4 I really only found playable on the PS2 (this is the only MI game I've only ever completed once - and not because I didn't enjoy it) and and I could never complete Grim Fandango or Broken Sword 3 simply because I couldn't get to grips with the controls. My loss, I realise.
We finally have a console that is so well tailored to classic point and click adventures, it seems a pity not to harness this. I'm all for first person controls for consoles that only have gamepads (Broken Sword on GBA worked pretty well), but those systems that are pointer based still feel far more intuitive to me. Having just spent the entire evening watching my girlfriend trying to jump onto a platform in Lego Indy (she managed to get to the idol in the first level after three hours then gave up and went to bed) I would honestly say that first person control isn't for everyone.
But hey, when all is said and done, controls are controls, the important thing is... WE HAVE A BRAND NEW MONKEY ISLAND GAME