Without generaliseing too much, i think Twizz, the kinda players you want (say, 14-19) to play fast aggressive ball just havent got the financial backing to play all the milleniums really.
Then when you get a bit later in life, say 19-25, a lot of these people could be good ballers but have commitments elsewhere.
Sure, you get the rare case (lets see people like the Pebbles and Al Frances of this world) who are early 20's, turning pro having earnt it and playing at the highest level they can right now (and before people point out Disruption is a SPL team, I KNOW) but for the most part tis demographic are looking at going to uni, setting up home and are at that age where girls become women and girlfriends become living partners. stuff like that. these things all take a toll on ones projection of playing ball 24/7...
heh, im not saying i could ever be or want to be a pro baller, but im 23 now, spent a lot of time out of the game doing uni - now Ive got a job, mortgage, woman on my arm makes it harder to focus purely on "playing all the millenniums".
thats just me though.
the demise of 7 man and the lack of ability to commit to a whole season of oeverseas play is probably part of the reason why I'm focussing on xball now, starting with the PA this season. I will probably do campaign but as for the others im not sure anymore.
personally i think xballs the way forward, i have never had as much fun playing supair as when i play xball (fight club being the highlight) and as soon as this style gets adopted across the board the better in my opinion.
even 5 man formats that arent "match style" like xball are just a bit dull now i think. of course, a big part of that is due to the events themselves and the quality of the fields etc.
hope that made some sense...