As far as upload goes I imagine the fact BT are testing G.fast with 50Mb up is going to be more of an issue than customers calling for more
Buffer bloat is partly taken care of by DOCSIS 3.1.
Latency and jitter will still not be as good as fast path VDSL or G.fast. Virgin could improve it by routing based on latency rather than other metrics but it would be a massive task and they can't control what happens to packets when they leave their network.
Until Sky/BT/TalkTalk start trumpeting higher upload speeds in the marketing it's not going to be something a mass market operator like VM are going to worry about too much. Due to the joys of VDSL, line management and interleave the xDSL operators advertising latency is a risky business for them.
I guess another issue there is you need a standardised measure of latency, too. Which should be used for me? First hop outside of home or to a specific site?
traceroute -q 1
www.linx.net
traceroute to
www.linx.net (195.66.234.8), 30 hops max, 60 byte packets
1 192.168.0.1 (192.168.0.1) 0.218 ms
2 *
3 host-62-24-255-10.as13285.net (62.24.255.10) 4.711 ms
4 xe-11-2-0-bragg001.bre.as13285.net (78.151.225.39) 6.227 ms
5 host-78-151-225-92.static.as13285.net (78.151.225.92) 6.903 ms
6 host-78-144-8-175.as13285.net (78.144.8.175) 12.448 ms
7 ge0-0.pr1.linx.net (195.66.225.254) 13.419 ms
8 fe1-1-112.tr1.linx.net (195.66.248.226) 13.467 ms