Time will tell, but I agree that the pros and cons are changing over time.
But they've been changing for a long time anyway. If you read the pros and cons
here you can see they have always been pretty sharp tradeoffs, and this is just another negative to consider.
If the EU gave everybody with FAA papers the equivalent JAA papers, accepted FAA STCs and all other Approved Data, and some other stuff, the N-reg scene would dry up. I remember saying this to a JAA Director some years ago and he agreed. But this will never happen because the present "winners" would start a war. The EU is trying to crack a problem which is 100% their own fault for creating.