It's been a long read to catch up on this argument, but it all comes down to how much each side feels is realistic to implement without having to put Blizzard through rigorous amounts of testing to balance an aspect of the game that is, twinking aside, nothing more than a minor stage in the gaming-experience.
Newcomers discover the game, granted, but as they work their way through the levels they will see the balance and dynamic of the game taking on a more static form when approaching the level-threshold of the vanilla-version of the game. This point can reasonably take everything between two days and a month. Additionally, sticking around at lower levels is hardly something that a newcomer aspires to do.
Experienced players hit 20 in only a few sessions of playing, and a fair few changes here will leave that unaffected.
I don't even have a rough estimate on how many players that will be affected by these changes over an extended period of time, but I have a feeling that it doesn't make it to five digits. Don't get me wrong, I do appreciate seeing the balance-issue taken up with Blizzard where you have the support of researched opinion, but I feel as if I have to point out that making these changes based on an extreme minority without reasonable amounts of testing (because I do doubt that Blizzard will devote themselves to this) and/or raw data beyond Recount-logs will in lead to tweaks for the masses, and we all know that as much as we wished that Blizzard as a company would want to support us, all they want to do is to leech from our bank-accounts.
The incentive is great, the trail of thought is good, but in the end it's nothing the majority of the current players will experience unless they make yet another alt-character.