After thinking about this for a few days and trying to put myself into the shoes of a non iDevice owning person I have decided there is only ONE thing I can say I honestly think was a big mistake about the XO-1. And this is, of course, before anyone has actually driven it to know how it works.
I think the ESC lock SHOULD be programmable via Castle Link from a computer. It sounds to me like the lockout IS actually a function of the ESC since switching to a different TX doesnt remove it. If this is the case I think an update to the castle link software would have been realistic. And if you think about it, could have accomplished exactly the same goal as the iDevice lock out. Castle link could have incorporated the same warning and liability safeties as the iDevice app... It is also something you have to physically buy separate from the car so they could still say the car is limited out of the box. Furthermore, it would still be true that only a more advanced, and therefore capable, user would own a Castle link adapter.
On top of all that, it would have opened up the car to a whole group of people who simply don't want to use the traxxas radio without leaving them unable to re-lock the car before re-sale. As it is now, if you DONT have an iDevice but you get the car unlocked, swap radios, sell the stock radio and want to sell the car, you physically CANT re-lock it.
So there you go, the only bad thing I can or will say about the car at this point. At first I figured castle would sell this ESC on their own anyway so all this would come available at some point. But then I realized that there are dozens of versions of Castle ESC's that are rebranded by other companies with different features than their castle counterparts that Castle DOESNT sell their own version of (example: HPI's waterproof Vapor/sidewinder ESC). So its very likely THIS ESC WONT be available from castle on its own... meaning they would have NO reason to update their own castle link program to adjust its functions...