The reason Euro English exists is because it's more convenient or natural for Europeans to speak it, so it lives on. English is a promiscuous language, so it's likely that unusual ("incorrect") forms will one day become a part of standard usage, given Europe's cultural and economic influence.
* assist (to mean attend)
* "How is it called?"
* possibility (to mean opportunity)
* actual (to mean current)
I speak a few other European languages with some proficiency so I'm aware of the reasons for some of these changes. However, there's no reason for the quotes around "incorrect" if you take my quote out of context. I specified that they would be considered incorrect by these native English speakers (if the intended meaning is what is listed here), if not just grammatically incorrect. I'm not claiming that there exists inherently correct or incorrect grammar.
English has become the global language, so there will always be local forms. You can't elevate one form above all others and claim it's the one true English. British English is not special in that respect, it's just a historical form.