Who the hell is timmy
I think he's referencing the TCG term "timmy", a timmy is a person who enjoys fun things, creates weird unique decks/talent builds, doesn't really follow the top end stuff or metagame, enjoys the backstory enough to be pissed if the backstory is changed for game reasons, does stuff based on his favorite characters, etc. The casual player, in other words.
That's the gist of it anyways.
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But yeah, this is their model and it works a lot better than the alternative EQ model where new players never ever have an opportunity to see it ever. This is great and all, but it actually wastes Blizzard's money in the long run since they pay people to design content that 99% of the fanbase won't ever see.
This way, they make the most out of their money, new players can experience "the past", the oldies can go back and check it out for good times, etc.
There's really no good reason why they shouldn't do this. Anything you could say against it would be stupid/not as profitable. The only bad part of this it is that right now the Hand of Adal and such are still being handed out thanks to a bug (but will be removed soon), and on a couple of servers the AQ gates are reopening, but thankfully that's being fixed too (and it might have been fixed already, I just got on the PC so!). But beyond those bugs being fixed & taken away, it doesn't really matter or affect anyone.