I'm sure the FAA has watched closely the transformation that occured in Europe over the last few years. At first, you're going to see problems in high density areas (NY, ATL, DC, etc.) getting aircraft situated, but I think it will be short-lived. The problem will be getting into the SUA with the large number of "non-approved" a/c that will be maneuvering at FL280.
I personally welcome RVSM and the added flight levels. I can't count how many times I had to stop in the high 30s for weight or performance issues when I couldn't climb from, say, FL390 to FL430. However, FL410 would be perfect but for the wrong direction I'd be denied my request. Same holds true for even flight levels. This dramatically increases our operational flexibility.
My biggest concern remains the owner/operator flying a CJ or soon to be certified "light-jets" who, while having been properly certified, doesn't keep up with the required knowledge and practice. This will certainly throw a snowball in equation.
2000Flyer