Whether or not it's "favorable", there doesn't seem to be much evidence that it actually exists as an alternative to national identity. The latter is as strong as ever in Europe. Some nationalisms seem to be growing stronger (Catalunya, Flanders) and new ones are emerging (Northern Ireland).
There is a European identity of course, but for the overwhelming majority of Europeans* it exists alongside - and ranks below - national identity. The idea that these distinctions would wither away in the EU looks about as likely now as the idea of successful monetary union.
*I've actually never met an exception, though I'm sure a few exist - undoubtedly more so on the continent than here in Ireland.