I kind of wonder, capital wise. the GDP isn't too far off US and there's def companies/families w/ insane amount of capital esp in luxury goods etc. Unless they're just hoarding it like Smaug and not investing it back into the economy, in which case the problem isn't capital but business culture.
European per capita GDP is half of the US average. Total GDP is between 60-75% of the US with an extra ~15% population. I'm sure Europe does have enough capital to do this build-out but its a shrinking pool as Europe loses ground to the US every year.