[Ignitionnet]

5:2 is actually about right - people seem to start losing upstream when their downstream drops below ~60Mb so it seems to be around a 3:1 ratio.

Looking at the stats I have recorded across my lines past and present:

Max:
Upstream rate = 21396 Kbps,
Downstream rate = 71320 Kbps

Max:
Upstream rate = 22764 Kbps
Downstream rate = 74204 Kbps

Currently:

Max:
Upstream rate = 21268 Kbps
Downstream rate = 63800 Kbps

As you mentioned, the upstream is clinging on while the downstream is tailing off as the crosstalk increases.

EDIT:

When I was the only connection live on the FTTC cabinet, the stats were:

Max:
Upstream rate = 29421 Kbps
Downstream rate = 98020 Kbps