Question...... What is the month/year that HTC uses to cut off what planes can go in each arena?

Junky asked this question in another thread. Not wanting to hijack it....
When HT first separated the main arena into early, mid and late, he only had late war rides available in Late war (for a day or so).
Many objected to being forced to choose what they can fly, I can agree with that view most of the time. However I find myself wondering 'what if' HT had sticked to his guns and didn't bow to the initial overwhelming cries of outrage? Reverting back IMO, made the idea of restricting the planeset by timeline arena pointless because most people fly where the numbers are. The two Late war arenas aren't restricted to timeline at all and are just the old MA split in half with the sometimes annoying caps. I ask what was the point then?
Would gameplay be better if most of the AH community decided upon drifting to mid-war? would dogfights be improved without the late war monsters? Would there be any need for arena caps if players were better spread between the three?
Also to the hardcore mid-war fliers I understand you like your arena now the way it is, this thread is pure speculation. I think the lesser of two evils is that we have gained two additional arenas and by putting up with the arena cap we still can have a resemblance of the old AH.
I can't really say I would prefer either format but I will say that the behaviour of the majority of AHer's IMO has remained the same. You still have hordes of players rolling bases maybe on a lesser scale but the end result is the same. The base will be taken eventually in most cases.
We see the same whines about gameplay but with a specific timeline we can hopefully introduce planes that will help fill the glaring holes in the current planeset to be able to better support all three arenas.