I think the "business logic" post highlights one of the basic problems of ATC financing in Europe. When demand falls off, prices tend to go up because of the full-cost recovery system. European service providers struggle to keep unit costs down but sometimes they too face a wall. Financing ATC in the US is on a completely different basis and the message, I think, is that there are lessons to be taken into account before the US financing system is changed.
As for the concepts... Some things will obviously work on both sides of the pond, others won't. The important thing is to ensure that there is interoperability to the required degree. Otherwise the airlines will not accept new developments. Lack of interoperability can kill most business cases. This is true even if we consider aircraft types that only operate in continental airsapce. Region-specific gear is always a lot more expensive than one meeting worldwide standards.
Overall, your point is a very good one. Neither Europe, nor the USA should introduce things that are not properly validated with the benefits proven beyond a doubt.