Just because it is the future doesn't mean you should use it in the present... I suggest wider reading and using your own experience to form your own conclusions.
I usually hand this to XHTML users:
http://hixie.ch/advocacy/xhtml
Until we can serve XHTML as true XHTML, it serves us no advantages over HTML, which if it was supported would be its treatment as an XML format.
Give me one reason why I should use XHTML over HTML and I'll happily retract my statement and start using XHTML... I was one of the clueless people that read about ZOMG XHTML FUTURE and used it because it was a buzzword totally pimped by all professional web developers, later understanding its concepts and "regressing" back to good old HTML 4.01 strict.
Bottom line is that the concept of writing good, semantic code and separating structure, style and behaviour is not limited to XHTML, and that XHTML does not instantly mean better code.