You don't think HTML 5 will come out within the span of our lifetimes? You are looking at things from a very short term mentality here. The internet is very young, the internet as we use it now is only a few years old. To say that a nine year old standard will stay forever is ignorant.
I don't like XHTML because I see no advantage besides a tag that says you validate (which I consider among the ranks of the web 2.0 naming fad).
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