I used to be hyped about IPv6 but now that it's actually (slowly) getting adopted I'm going to miss the clunky old ways. No more sitting behind three badly configured NATs. No more scanning the entire internet in 5 minutes T__T
Even then, hole punching should get significantly easier, as you know the IPs and ports of both parties. Multi-layer NAT with port guessing is usually a nightmare when establishing a direct connection.
I used to be hyped about IPv6 but now that it's actually (slowly) getting adopted I'm going to miss the clunky old ways. No more sitting behind three badly configured NATs. No more scanning the entire internet in 5 minutes T__T