I think this argument is flawed for a few reasons. First of all, you really can be competitive without full team doubles. On the Worlds score sheet, tumbling only counts for FIVE percent of the entire score. Having a few doubles on your team alone won't win Worlds, that's for sure.
Second of all, doubles are hard, and that's why there aren't so many of them. Imagine if you had a division where you HAD to have doubles, not just fulls. I can't even imagine there would be more than a handful of teams nationwide that would even qualify for that division. And really, how many teams have full team standing fulls/doubles? I honestly can't even think of one. If we're basing divisions off of a hypothetical situation that hasn't even happened yet, then there's something terribly wrong.
The tumbling coach in me disagrees. Doubles are not hard - it is just that they are not trained properly as progressions are rushed. Many athletes do not even get the chance to get comfortable with throwing a full in competition and fixing it to make it look right before they are being challenged to learn a double by a coach, parent, another athlete or just because they want to make the show team in the gym. I think there are quite a few teams that may have fulls squad running fulls. Heck my restricted team has squad running fulls on a good day although I would not compete all of them yet.
Maybe not true squad doubles across the board but the bar is very close right now to being there for a couple of the elite teams. Wont be a few more years and it will be like tick tocks. :-)
Lastly, you seem to be making an argument for gyms with new level 5 programs. No matter what level, you can't expect new small gyms to come out of the gate winning every competition. Older teams have been raising athletes and training them for much longer, so obviously they're going to be more experienced.
I am making an argument for true competitive balance, not just having teams say they are level 5 when they are in reality Level 4 with a few Level 5 skills thrown in. Or having teams saying they beat 15 teams to win a national Championship when in reality only 3 of those teams had a competitive chance to beat them. There is no hate towards the older teams at all. Congrats and keep on doing what you do.
And where did I say anything about winning?
The biggest thing is that I can't help but feel that your post promotes like...and equal chance at winning, not an equal chance at competing. A team that just graduated from level 4 to level 5 really shouldn't be able to suddenly appear and start winning Worlds. There should be a natural progression. What you seem to want is that dreaded "50 National Champions" at one event. The nature of competition is that some teams will vastly out skill the others, and that's what working hard and training is all about.
Coming from the world of gymnastics and wrestling I can't stand the 50 National Champions concept. But since you called that out, lets call it what it is. A marketing strategy implemented by EP's to get gyms to come to their events. Having worked for a small one I know what it is. All gyms want a season ending type event for their athletes with some type of major award to shoot for. Big and small, all star and rec. But either budget wise or skill wise, they can't afford to go to what we like to call major competitions. Yes sometimes they are afraid of losing and subsequently losing athletes off their team to another local team there. Sometimes it is money as they can not afford airfare, hotels, and costly entrance fees for both athlete and parents. But sometimes they just plain recognize they are not there competitively yet. They will often tell the EP's reps that if it is not a National Championship type event, that they are not going. So the EP's recognize they can make that money if they offer them a Local Yokel Greater Tri-State National Championship banner and hoodie. That is a $$$ thing on the part of the EP's that they don't want to give up. And in a capitalistic market they should not have to, even if it muddies the waters so to speak.
To sum it all up - a team with fulls certaintly can compete against a team with doubles - there's a lot more to a routine than just tumbling. But if you want one of the top spots at Worlds, start working harder, not clamoring for a new "restricted" division.