Is it a clash of civilizations? No - a clash of civilizations implies two civilizations (at least). The rioters in France aren't civilized and shouldn't be dignified with a claim that they represent one.
Austin Bay (the second link above) talks about "encouraging “Euro-Islam,” (France has been doing the latter.)" I find this an odd idea - what makes us think the French (or any) state is going to do a particularly good job of creating a state religion? European established Christian churches have been decaying for a long time. "Euro-Islam" seems likely to produce a bunch of state subsidized, empty mosques just as "Euro-Christianity" has produced a bunch of state subsidized, empty churches. That seems unlikely to placate the rioters (although it also is hard to understand why France might want to placate the rioters.)