TCP over UDP

The last IETF meeting was held in Philadelphia last week. Recall my previous posting about turning the protocol stack upside-down. Jonathan Rosenberg, who is with Cisco, presented a new trend in a talk at the meeting: TCP over UDP. The main motivation for this approach is NAT traversal, which can be done using UDP pretty well. Unfortunatly, the UDP protocol has, among other things, a lack of flow control, which is a pretty compfortable thing application level programmers do not want to miss. The combination of both advantages (NAT traversal and e.g. flow control) results in tunneling TCP over UDP. Thus, there is one more best effort datagram protocol layer in between. Does this endeavour highlights the need for a new Internet, as researcher in the Future Internet sector are claiming?