OK, OK, force me to write something constructive why don't you
I agree that Xball is a good format, for all the points raised here and elsewhere. The intensity, the agression, the longer game times meaning you can gain a sense of following something through and the (sometimes) nail biting finishes and comebacks.
But I also like the 7man way, and its obviously popular.
Here's my guess for an NPPL format every div can play that is more of a tweak but is basically using 7 man rules.
NPPL has 18 Pro teams, so 2 Divs of 9 give the normal 8 prelim games. Everyone else in their usual also ran divs playing amongst themselves.
Top 8 from each go into Sunday. 1st plays 8th, 2nd, 7th etc - sudden death in best of 3 games through to a final, play off for 3/4th maybe. Thats an easy system, everyone gets similar number of games, easy to sell and visualise too. Also gives the incentive to get the best score in prelims, you get best draw on Sunday.
The best of 3 might be tweaked, you could run a 15min total game time idea, most points scored within the time etc. Scheduling wouldn't be difficult, 4 divs with 8 x 15 min games each you'd probably need 2 finals fields for Sunday. All 4 divisional finals could be on NPPL field too over a couple of hours.
How about that?