The answer to the OP's question was given in another thread. Basically they couldn't make it financially viable with 9 footers.
I guess I have been too negative towards the 7 foot tournaments. In the US at the moment, most players seem to be league barbox players, so it makes sense to have tournaments on them. I definitely think "barbox" should be in the title, though.
Personally I don't think it really counts as pool. It is less skilled, less interesting to watch and over all an inferior game to 9 foot tables. I also believe it will over time diminish the skill of US players compared to the rest of the world. Luckily the chances of the 7 foot trend has of being exported around the world are very slim indeed. So as a foreigner, it's not the end of the world for me if you ruin your own pool scene. It does make me sad as a pool purist and lover of watching high quality pool, but it doesn't impact my own playing in the least. I and others with me in Europe and Asia, will continue to enjoy the large table game and you Americans can continue to enjoy your little tables. Then, when your ass gets kicked in international competition, you can continue to blame your loss on team spirit (or lack of it) or other such nonsense.
You are still reaping benefits from having players that grew up on full scale tables. The next generation of players won't have had that luxury. Talented individuals will still emerge, but they'll be fighting an uphill battle against the Pinoys, the Chineese and to a lesser extent Europeans (as the game is declining in popularity here as well).