I'm looking at TAPS too as I'm looking for a general transport API other than TCP/UDP.
Full user land implementation, which seems to be accepted nowadays, but not at all a few years back.
The API however is a hack of the INET API, which is rather obsolete, but this is what current apps can use.
So, hope TAPS gets traction.
And yes, IPv6, absolutely. Going through IPv4 middle boxes is a nightmare. No hope there.
And yes, flow queueing, absolutely. Flow isolation, becomes fundamental is such a zoo, or jungle.