I don't anticipate national teams, in the sense of riders all from one nation. I'm just looking at Sky, Katusha and Orica Greenedge as possible models. Australia pioneered the Institute of Sports concept, which bridges the gap between amateur and professional.
What we have seen in the last two decades has been a fusion of the soigneur culture of pro cycling pre 92 , and the systematic doping of the old Eastern Bloc sports institutes.
The dissolution of the East German sports institute was the opening of a Pandora's box, all the expertise inherent in that body was dispersed around the world. We need to contain that part of sporting culure within appropriate structures, it's our only hope.
Sky, Katusha and Orica Greenadge are quasi-autonomous offshoots of the national cycling bodies. That works for nations with a certain type of cycling culture, It would work for Germany. It would work for smaller nations if they combined, so a Scandanavian team might be viable, or at a regional level, a Breton Team for instance.
There will always be freelance riders from the likes of Canada or Slovenia, and they will probably find slots as domestiques or sprinters. But the thrust of the teams will be to find and develop domestic GC and Classics riders.