I wish I could share your optimism, but I don't think so. I believe that Pres Bush has shown himself to have feet of clay at the most inopportune moments....including this one. There were a number of excellent, principled, constitutional candidates for SCOTUS nominee, and instead Bush gives us a blank slate that we are all trying to fill in and guess at the outcome. Even Bush himself declared that he did not ask Roberts for his opinions on key issues. So we all left with trying to second guess and determine what kind of a justice he will be.
Personally I think that Roberts is doing as much as he can to disassociate himself from conservative views or positions in order to curry favor and placate the liberal/left-wing Dimwits.
I hope you're right and I'm wrong.... but I believe that Roberts will break left once he is confirmed and fully set as a SCOTUS justice. I believe that Roberts will be conservative in big business rulings and liberal/activist on issues of abortion - gay agenda advancement - restrictive religious rulings - social/cultural issues - expanding govt power over states & individual property rights, etc. And then once again, the conservative majority base in this country will be left to bemoan how this could have happened again? (or to be more precise, for the 8th time out of 11 times).
I'm still cautiously optimistic that Judge Roberts will be a constitutionalist Supreme Court justice. But if you are correct and he breaks leftward the way Warren, Brennan, Stewart, Powell, Blackmun, Stevens, O'Connor, Kennedy, and Souter did, then it might finally be the watershed event that causes Christian voters to abandon the GOP.
There is no certainty in such matters.
Eventually, as old age and death come to the individual, I expect that great nations each run their course. Our descendants will not forever enjoy this great nation as we have known it, but we must continue to extend its life as the most vigorous fountain of freedom in human history so far, as best we can, for as long as we can.
As Reagan showed us, do not overlook the value of optimism in the face of uncertainty.