[Jagat]

There's a market for that geared towards senior citizens (they show up in daytime tv ads).

They'll exist as long as there's a market for it.

That said, the definition of 'dumb' phone is going to vary, and senior citizens in 30 years will be seeking what looks like today's iPhone, or an android phone. Maybe.

[birdyrooster]

I bet we move to a different medium that is easier on seniors bodies. Many seniors complain they can’t see the screen and their dexterity isn’t good enough to use smart phones easily. Judging based on my anecdotal experience with the elderly and those needing accommodations speech to text, text to speech, accessibility features and airplay are commonly used and I think this trend will continue.