Yes. Many of us spent more than 100 hours developping a single city (I'm personally over 200 hours now) and it is clearly disappointing that we'll be unable to make it benefits from the European set.
I guess that like many other players, I will be constrained to ignore the European set because continuing my work is just more meaningful. That's really sad though as I've put a lot of effort to give different identities to my neighbourhoods and benefitting from the new set could have really helped for that purpose.