I think that view is fairly common, Maik .... also, you need a fairly beefy PC to run Vista anyway, which is another deterrant.
I bought a laptop about a year ago, and it won't be Vista-ready (it has 768MB Ram, and they recommend at least 1GB, although I can upgrade it to 1GB, still not good to run with the lowest recommended amount of memory).
Also, I think the graphics card is only 64MB, and you'll need a 128MB card to take full advantage of Vista.
All this costs money .... who's going to shell out for a new OS that may be riddled with bugs?
Also, XP was billed as Microsoft's "most secure OS ever" and they've been using the same line to describe Vista.
Not that I'm trying to be negative or pessimistic, but you do have to consider these things