Well I'll be unemployed at the time (happy coincidence) and I've got plenty of money in reserve, so I'm going to specifically hold off on the job hunt to give myself as much time with The Witcher as desired (I'll also be reading the whole series and replaying 1 & 2, plus I'll have PC GTAV to get to as well)
I'm going to be there the minute the game is playable and then I'll probably just play through the game again once all the 16 DLC's are released.
I don't really see the point in waiting for the DLC's. It's just going to be very minor stuff (as we've seen), and considering the nature of The Witcher everyone who likes it is going to replay it at some point down the line, so you'll get to experience it with all those DLC's later. If you're waiting to play because of possible bugs/issues/optimization, well then that seems reasonable to me.
Not doubt there'll be a few bugs and issues, but hopefully nothing gamebreaking. I know a lot of people had issues with TW2 on release, but I personally experienced only a couple of very minor issues, so hopefully I'll get lucky again, or CDPR will be able to pull off a relatively smooth 1.0 game.