Well worth a look at the series of tweets underneath this one.
https://twitter.com/uglygame/status/92823743805252403214% rise in attendances is a misleading stat if you quote it in isolation. Last year's gates were ~50% down on the year before so gates are still down by a third on what they were.
Particularly pertinent is the question of what happens when England get knocked out of Russia 2018 in the group stage/2nd round. I can certainly foresee Scudamore & Glenn knocking on Shaun Harvey's door with a wad of "proposals" backed up by some more TV dosh.