Will it still be good in a year or twos time for the use of WOW?
Yeah if you stick to playing wow for a year or two why would the game requirements get more harsh?
If you play world of warcraft the requirements wont get more demanding... Unless they happen to create a totally new wow with a brand new 3d engine..
For your uses you told me it will last a good year no problems. If you want to play like one of the brand new games coming out by the 3rd or 4th quarter of the year then that card will have problems at them on high settings yes for shure.. example the game crysis from crytek will take high requirements and will be released later this year. Even my video card will have some problems playing crysis on high settings so dont feel bad..
It will be one of the first directx10 games.
Games like wow and such the x1600 will do fine, but remember a video card wont last that fast forever.