With Google Glass, I think it is different because the initial batch is almost a public beta. I really doubt that this type of restriction will be in place when the product reaches the point where they are widely available for purchase without customers needing to apply for the privilege to buy.  Otherwise, I wouldn't purchase anything that put such a restriction on what I want to do with it, and for those that do I have no problem disregarding those restriction the same way I do when my carrier tells me I can't root my smartphone.