I think a big issue is that Europeans who want to invest in early stage VC do so in the States, because everything is geared towards entrepreneurial success there. Changing the business environment across the EU is necessary but definitely not sufficient to kick start the VC-backed startup scene in the EU.
I think the big issue is that this is what Americans want to believe because it reinforces their exceptionalism. And of course there are Europeans who would choose to believe it because it absolves them of failure.
It used to be the same for founders. If you wanted to raise, you went to SV. SV used to be the Schelling point for funding.
> big issue is that Europeans who want to invest in early stage VC do so in the States
I haven't seen that personally, most of the VCs I've worked with here in Europe who live here in Europe, invest in European companies. Most of them invest in companies in the same country they live in, because it's a bit of a hassle to invest in companies from other countries currently (hoping that EU-INC makes that easier), but none of them regularly invest in US companies.