Re: Sounds like common sense....
Double the infrastructure ( as it's more sensible to sandbox non-eu data from eu data) and double the lawyers as now they'd have to understand US law as well for any US-originated data that may be held.
Also Co's would have to agree, under some circumstances, to be subject to US law wherever in the world they operated. Sounds like a jurisdictional trojan horse to me.
Don't see everyone jumping on that bandwagon