This will be enabled by changes to the underlying infrastructure - moving away from BGP and adopting (BGP backward compatible) protocols like SCION[1], as currently implemented by Swiss carriers, which allow improved traffic shaping, and more importantly: jurisdictional geo-fencing.
We'll also see more legislation by the EU to level the playing field against US companies who currently do business with a Double Irish Dutch sandwich.
The current model where the US is the only cloud provider with virtually no EU based competitor and where EU data is locked into US corps is unsustainable. Europeans trust into US companies has never been strong to begin with and current politics (+horrible foreign policy) will reduce it further.
The cloud is dead imo. Because in a climate where national interests are suddenly more important than partnerships and international trade, the cloud is more of a risk than anything else. The US makes that same case too, illustrated by their hostility towards Chinese products (I'm not defending China here at all btw).
[1] https://www.scion-architecture.net/
edit: I have to dig up this quote again from Aral Balkan's recent talk at the EU parliament: "You are acting as an unpaid Research and Development department for silicon valley. Because if a startup here succeeds, it gets bought by Google or Facebook. If it fails, we pick up the bill.": https://video.lqdn.fr/videos/watch/861c07f7-7e9b-4e64-9765-c...