I won't happen, as it is hard to fire up moderates for such a big task as unseating an incumbent. If there are conservatives with conviction and personal motivation, that is one story, but once you get out of the right or left, such grassroots motivation is not there.
For instance, I seem to recall you (I'm not 100% sure it was you but I'm almost positive) touting a moderate group in Texas several years ago whose motivation was to remove Ron Paul in his primary. It ddidn't work then and it won't in the future.
There's a huge difference between Paul and Tancredo. While Paul has been a maverick in DC he hasn't crossed the line in actively campaigning against his peers. Whether he directly participated or not, through bay buchanan and his PAC, Tancredo has crossed that line. Grassroots motivation is nothing compared to the motivation of party bosses when people jump the reservation. If Tancredo keeps allowing the buchanan's to use him, particularly in this fashion, he'll learn a very painful lesson in real politics...one he needs to look no further then pat and bay to see.