First off, no country, company ... anything for that matter, stays in power or popularity forever.
Second, I think Apple has enough momentum that will carry it for years to come. True, that momentum will be dictated by corporate decisions made going forward, but even just with the iPhone, iPod, iPad and iTv, Apple has a firm grip in the technology for for years to come.
I agree with others. Jony and the other design team members have a lot of talent and skill. Jobs was the conceptual backbone behind the iPhone and iPad, but others really made it a reality.