It is fair to suggest that some of that TCP-specific infrastructure impedes progress.
However, I don't think it is fair to suggest that QUIC will do anything to fix that infrastructure. QUIC, for better and worse, intentionally kicks the can further down the road by hopping around on top of UDP infrastructure. Maybe some QUIC successor will have the guts to move things to a proper top-level protocol, but QUIC itself isn't yet that step.
Even on top of UDP, it still bypasses TCP-specific infrastructure. It will still be subject to any UDP-specific infrastructure, but that has a significantly smaller scope, at least if you exclude measures that (for better or worse) middleboxes could just as easily apply to traffic using a new top-level protocol.
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It is fair to suggest that some of that TCP-specific infrastructure impedes progress.
However, I don't think it is fair to suggest that QUIC will do anything to fix that infrastructure. QUIC, for better and worse, intentionally kicks the can further down the road by hopping around on top of UDP infrastructure. Maybe some QUIC successor will have the guts to move things to a proper top-level protocol, but QUIC itself isn't yet that step.
Even on top of UDP, it still bypasses TCP-specific infrastructure. It will still be subject to any UDP-specific infrastructure, but that has a significantly smaller scope, at least if you exclude measures that (for better or worse) middleboxes could just as easily apply to traffic using a new top-level protocol.