I think so. Like a said in an earlier post on another thread, assuming even distribution and adequate supply, I think there will an initial rush for the first 10 days, a level off in demand, and then another upward demand trend because the early adopters will have determined if there are any defects, problems, etc. The last upward trend is because I don't think there will be any big problems.
Given other rumors about engineering (OS and battery problems), and Apple's supposed response, I think that there will be relatively few problems, and mostly they will be associated with carrier service than with Apple engineering.
However, Apple will most likely take a media/potential customer hit if Cingular/ATT has problems. Guilty by association, even though Apple has nothing to do with it.
I think it needs to be said that Apple is taking a huge risk with their name with the service performance of another company. I hope it works out!!