I don't remember which, but there's a book out there about modern German history that begins with the sentence, "In the beginning, there was Napoleon." If we see something like nationalism, which we probably will sooner or later, it will have a remarkably different character than it did in OTL. When Prussia bests Austria, which is probably unavoidable by the start of the 19th century, we might see something like the German Empire that makes no claims to being German. In this case we may see them leave Alsace-Lorraine alone but grab some territories the Kaiserreich didn't have IOTL. It's also possible that Prussia will revive the HRE, which may still be around if Napoleon hasn't dealt it its deathblow.
I don't know enough about Italy to speculate very well, but perhaps the Hapsburgs will turn to the Peninsula when Prussia knocks them out of the Germanies.
On the other hand we may just see a bigger, badder revolution happen a few decades later. France, as usual, is the best candidate. In this case what happens in Germany and Italy would depend heavily on the political developments between the OTL revolution that didn't happen, and the new revolution that did.