I am not sold on the belt drive. I just don't get, what is the advantage?
That chains wear out every couple thousands of miles. .... well big deal. get a new one, it's not like the cost anything.
That you need a chain guard if you want to keep your pants clean? I don't see that as such a hassle, what's wrong with a chain guard? You don't necessary need fully-enclosed.

And whats the disadvantage of belt drives?
You need get a new bike (ouch!)
And don't think about getting one with derailleur gearing (big ouch!!)