I believe in the phrase, "The Simpler, The Faster", especially when it comes to the switch (router) architectures. The higher the network bandwidth, the firmer I believe in it -- it does not make much sense to me that, messages stay longer in the switches (routers) while they move faster on the links - no real advantage!
I also believe in `feedback-based control mechanisms' even under high bandwidth-delay product networks. Feedback provides some form of information on the network, whether the information is old or new. Recent studies have revealed that the observed network traffic, as well as the distribution of file sizes in file systems, is self-similar, i.e., the pattern of network traffic is invariant (to some extent) on the time scales, which signifies that the network traffic is long-term predictable. The utilization of this notion goes against ancient Egypt to control irrigation system for preventing flooding. I speculate that the idea of using history(i.e., feedback) to predict the future (i.e., congestion) might provide an effective solution for controlling/regulating the flow of messages in network systems, regardless of the scale and speed of the network, if the feedback information is used right. After all, we live in the world with history that repeats itself -- another self-similarity -- and people learn tomorrow from history.