The only thing having a tournament on 10-foot tables proves is who plays on 10-foot tables best. That's about it. If you had a tournament with the same people on 7-foot tables, there's reason to believe you will have entirely different results and that tournament would also prove who is best on 7-footers.
I would say the last TAR race to 15 in 8-ball did not prove who played better 8-ball on a 9-foot. Also if you think that there is not alot more of a chance of a person who is considered the weaker player to overcome a opponent in any normal tournament length race on a 7-foot I don't know what to say, do you think Simon Pickering is a better 8-ball player then SVB on any table?
I would love to see the 10-foots become the standard for pro pool, WITH tighter pockets as well. The reality is that the 10-foots HAVE shown more of the true hierarchy, we saw only afew events on them but it became more clear who has better pool fundamentals.
Saying "oh it just shows who shoots better on a 10-foot" is WAY under-stating what it actually shows. It takes a higher level of aiming ability to pot balls on a 10-foot. Cueball control on a 10-foot is more difficult and thus the tables take a higher talent in shape play. On shots where one needs to spin the ball and put some power into the stroke the 10-foot requires far more stroke to get the same result and thus the table rewards a more powerful stroke. All of these things are part of what make a pool player great, and the 10-foot really tests these things at a new level we are just now seeing and the difference in the top players are starting to show.