Sure, it would be a huge amount of work to fix/replace TCP. Google is one of the few companies with the resources to even attempt it, so it's disappointing that

Sure, it would be a huge amount of work to fix/replace TCP. Google is one of the few companies with the resources to even attempt it, so it's disappointing that they aren't making it a priority. The really frustrating thing is that Google is already working on QUIC, which is probably the best approach with a realistic chance of success. It removes TCP from the stack and provides a general purpose transport layer rather than one which is tightly coupled to HTTP. Unfortunately Google decided to push SPDY with it's own kludged up transport rather than taking the time to do it right with SPDY over QUIC.