If you have to make a grand reveal to the world and change all of it a la Steve Jobs with a single product, you're dead in the water. But we have the Internet and crowd funding and open source these days. Which part of the thing are you most interested in building? Go build that on top of whatever's closest, open source it (yes, even hardware), and iterate from there. It's a failure of the imagination (or perhaps the wisdom of age, or the lack of the foolishness of youth) if you're blocked by the fear of selling out the user.

Do not discount the cynic. I persist. Here is my question, for example. How would Apple and its ecosystem have evolved differently if they never adopted Objective-C? Would it be possible to accomplish everything with C and better tooling?