Dot Mobi for everyone?

Today the .mobi domain is available for everyone to order. Now, if I try really really hard, I can actually imaging a world with this domain in it, and I think that I would... errhh... use it? On my current cell phone I would, yes, but wait.. What about tomorrow? Will it be worth the money and effort, to develop content only for this type of domain?

Will this .mobi ever be popular? And if it does, will it be by demand? Why is this new extension even needed? Why would you not develop future websites, to be able to handle both handhelds and normal browsers? Why would users with handheld devices want to limit them selves to special .mobi URL's? And why why why, do we even discuss all this, when all handheld devices within short time, have normal fully featured web browsers?