Well, the problem is really that we haven't finished (or even started) deploying bloom filters. It means the RAM requirements are going up over time as Bitcoin usage scales.
There's no theoretical reason Bitcoin can't run well on your phone. But as Andreas said, we haven't finished all the programming for that yet.
It already runs well on mobile devices through web-based thin clients. It may not be your ideal security scheme nor be a node like you like, but it works just fine for the end user. And they will move on without your suggestions.
No, Bitcoin will not die because everyone and their grandma is not running a node. Mining nodes can become numerous enough.