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Realistically, that could help Germany and the other EU states to compete with both the United States and what could become other superpowers (China and India most prominently, though India is rather lagging whether the Indian nationalists on this forum will acknowledge that or not). However, it would be completely understandable for Europeans to try to preserve their national and regional cultures. The American states do have some individual cultures of their own, but to a MUCH lesser extent than Europe (obviously).

Beside a general political discussion whether we will see a united states of europe or if this is a goal we should try to archive the reality for the people at least in many regions has changed very much in the least two decades.

Germans work in luxembourg people from luxembourg live in germany germans live in france while many people from the netherlands prefer the cheaper house prices in germany. With the same currency no borders with a common market and the common laws in my opinion it is simply a phylosophical question how to call this project.

The main real differences are the different tax laws and the advantages or disadvantages but even here it seems very likely that this will change.
There are cultural differences but in my opinion that´s a huge advantage and a gift and hopefully there are not so many changes here.