Once you start mixing politics and software methods, most people tune out at that point. That's the problem - it's such a dry topic for most people that unless you're a geek, you're likely not going to care so much. And even if you're a geek, it doesn't necessarily mean that you'll agree with the FSF in the first place.
The closest phone we've seen so far which adheres to the tenants of free software as thoroughly as possible has been Openmoko's Neo FreeRunner, which was complete shit. You have a normal person compare that thing to the iPhone, a heavily proprietary design, and the number which would select the proprietary phone is so far slanted in its favor you'd stop taking votes after a while.
People end up not listening to RMS after a while because he comes across as the crazy man sprouting a bunch of things that, unfortunately, are often true, but are also mixed in with other stuff that ends up being hyperbole that destroys the whole message. Plus, what he advocates is generally to go without something that people often enjoy using (iPhones), and people don't just change because some bearded toe-cheese eater told them too.