@bisonhero: The two telltale guys shipped way more than just TWD Season 1, they were working at Telltale pretty early on, and were leads on the first Poker Night game I'm pretty sure.
I know they worked at TellTale for a while, I just mean that everything pre-Walking Dead was kinda ho-hum in terms of sales and critical reception (Poker Night, Jurassic Park, Back to the Future, Tales of Monkey Island, the later Sam & Max stuff).
The Walking Dead is the only really big success story the studio has had in recent memory, and it seems like as soon as Rodkin and Vanaman got their names out there by doing a bunch of press interviews related to The Walking Dead, they couldn't wait to get out of there and do their own thing. So I don't know if that speaks more to them not being at all interested in making a bunch of Walking Dead clones at TellTale, or they just had some game they've been wanting to make on their own for a long time, but I still think it seems kind of sudden to immediately leave a company after just finishing the most critically acclaimed game you've worked on.
Anyone who creates anything for a living doesn't always have the luxury of working on something that is personal and/or meaningful to them. While Vanaman and Rodkin both probably put a lot of themselves into the Walking Dead, it doesn't necessarily mean that more Walking Dead was something they wanted to do. They were fortunate that TWD earned them the recognition and clout to be able to forge their own path away from Telltale and now they get to make the games that THEY want to make, not something that's licensed from existing media.
There's nothing wrong with taking what you've earned and creating something new with it. For both of them, the safe decision would probably have been to remain at Telltale and work on the all-but-guaranteed hit that would be TWD Season 2. The fact that they decided to take the risk and leave to do their own thing is pretty respectable to me.