This is not guaranteed, especially if someone reports it to Nintendo for the reward and then Nintendo silently patches it. I imagine we can't stay on 2.0 forever though, but I'm going to wait until it's absolutely necessary to update. If you are really paranoid the best thing to do is get a second console and keep it on 2.0. If an exploit is found on 2.0 in a year or so watch the mad rush of people going to buy another console in the hopes they are still sold with the 1.0 firmware haha! Then selling their updated one. But then 1.0 doesn't have a browser lolz. I'm guessing the first exploit will be a hard mod.