I mean, there's software reasons(Was it XP or Vista that couldn't handle a certain amount of RAM that made the market panic?) that things arn't backwards comptiable as well as hardware reasons(can you picture a WinXp game trying to make full use of a six-core cpu with dual video cards and a bucket of ram?) for upgrading.
I dunno, like I said I don't have the full explantion-post that laid it out pretty well and I'm sorry; but I don't really see a reason NOT to upgrade. Sure, maybe not the day of or something, but there's enough bonuses from where I'm sitting(improved handling of hardware through windows, more up-to-date security stuff, simpler access to the newer games(which will also benifit from the handling thing), plus its not a set-in-stone thing. Don't lose your license for the previous version of windows.)
I'll be 1) Backing up my Steam Library and the like beforehand.
2) (Make sure you have a physical system restore disk)
3) Waiting at least a few weeks, probably closer to a month, to let them figure out the worst of the issues(8.0 to 8.1, after all)
4) Jumping in full throttle.
5) If something goes wrong, use my re-install disks to revert back to Win7 and lose a minor amount of time from the whole ordeal; and try again in a few months.
MOST games that are post-XP should work pretty well from what I've heard/read; and even XP games should DOS-Box well enough. Of course, that's so hit-and-miss even in 7 YMMV as usual.
I unno. Just seems like there's more reasons TO for me than NOT TO. But, of course, to each their own.