I like your ideas, but there's something you should know, since it seems you're unfamiliar with Telltale.
Telltale specializes in point-and-click adventure games. Almost all of their games have been point-and-click adventures. The only exceptions have been Telltale Texas Hold 'Em and the upcoming Poker Night at the Inventory (both poker games), and Nelson Tethers: Puzzle Agent (Professor Layton clone), and even those were designed with their Telltale Tool engine (which exists specifically for, well, point-and-click adventure games). Most of their games have also been episodic. Rather than release a large, full-length game, they prefer to release a series of small connected games within a short span of time (usually a new episode each month) that create a full game when seen as a whole.
Even if Telltale wanted to, they couldn't make Jurassic Park into a free-roaming sandbox game. They would need to either use a different engine that they're unaccustomed to, or alter the Telltale Tool to the point that it barely resembles its usual self.
That said, I believe an interview with a member of the Telltale Team (Dan Connors?) from a while back said Jurassic Park would be something of a departure from Telltale's standard formula, and the sneak peek of the Velociraptor model we saw at PAX had a realistic look. So while it might not be the intense action game you're picturing, I'm sure they're doing everything they can to make sure their Jurassic Park game is, well, a Jurassic Park game.
(Also, how come both of the upcoming Telltale/Universal games have all these people saying it should be a free-roaming sandbox?