Yes, but it should better performance in real life as the estimator includes an allowance for cross-talk. Vectoring ought to enable lines to perform closer to the theoretical performance for the loop. I was basing this on the (limited) trial results I've sen.
This very site published this news item.
If the chart is to be believed, at 1,000 metres it shows an improvement of about 6-7mbps. with a potential over 30mbps.
** edit **
I found this thread on the Eircom trial (which has a similar copper to the UK's). At 1km it shows an average of about 38mbps for a 1km line with vectoring enabled,
Now none of this is guaranteed of course, but it may not be so ridiculous. I get a 57mbps sync on a 700m line on a cabinet enabled for about 18 months (I signed up after 6 months). The graph suggests maybe 65-70mbps with vectoring, which is credible.
Edited by TheEulerID (Sun 11-Jan-15 14:27:41)