Too many suckers have too much time invested in WoW.
Pretty much. Why would anyone go through the grind to get max level and raid geared, etc. in a new game that does almost the exact same thing as the old game that you are already max level and raid geared.
Rift was WoW with a "twist" in that it had the constant invasions and shite going on. I briefly played the beta and it felt almost identical to WoW. That plus the idea of having shite constantly shifting with invasions sounded kind of annoying are why I never made the switch.