The incentive is that Americans are huge consumers and closing markets to US also means losing US markets, that's why Trump's taxation on Americans for imports(AKA tariffs) caused huge stir. That said, if the risk is not tolerable then it's not worth it and can be sacrificed. EU was fully on board to do that if Trump invaded Greenland and EU as rest of the world are aggressively diversifying.

BTW EU will never have a "tech" industry in any meaningful size as long as US have access to EU markets, anyone who eventually got tech industry are those who blocked the US or were blocked by US.

So if US keeps its course, in a few years we may end up with fragmented markets with US blocked out because the US is very unpopular but the current politicians everywhere including in the EU are very pro-US actually hoping that current situation is just a glitch, which is not aligned with what the general population demands and as a result the next elections they will align with anti-Americans.