Even though I'm a big iPhone fan I can't see the iPhone holding it's lead forever. But Windows Mobile is horrible, most people can't figure out how to make it work, nut already there are programs you can run that take away most of the horrors of running it.
I would like to see three versions of UAE, one for iPhone, one for Windows Mobile and one for a Linux, possibly Android.
As somebody pointed out most phones are about as powerful as Sam (at a fraction of the price) so UAE and Classic Amiga stuff should be about as fast on a Mobile as they are on a Sam....