There is always some amount of uncertainty.
Introducing large amounts of uncertainty is destabilizing. Not saying a Miers seating would be destabilizing, just making a general comment, and certainly the selection process is a bit unstable, and I think that can be traced directly back to the degree of uncertainty.
Wouldn't it be a hoot if Miers is confirmed, and the first case that comes up, Roberts goes left, and Miers goes right?
Depending on the underlying issue in the case, judicial restraint does swing both right and left. There is enough complexity that labeling is a waste of time. But I hear you, what if each swung "opposite" from what the conventional wisdom said they would do. Liek som mnay other things, we'd discuss it, shrug, and go have a beer. ;-)
I know WE would! LOL