Is this possible?

Well here is the blurb on this:

http://www.spiegel.de/international/world/eu-worries-over-u-s-economy-grow-a-1166809.html

Of course it will be Europe minus UK that will take the place of the US if it happens.
And that might not be a good think because Europe as she is has no experience being a hegemon. The one with the historical expertise to be one is UK; and she ain't there to help Europe.