1. It's getting smaller. Maybe not right now - I don't know the numbers, but I could imagine that as more of the developing world gets 'dumb' phones, the proportion of dumb to smart phones will actually increase. However, long term, it's a shrinking market. To be fair, you could say that about nearly anything. Eventually there will be a disruption or a move to a newer technology. In this case, that movement is already happening, however.
2. Will 'dumb' phone users spend money like 'smartphone' users? If the point is just to make your app/site accessible to those users and gain market share, then it may not matter. But if you want to sell them anything, it very well may.
Regardless, the recommendation to "ensure that your web-based applications are compatible with Myriads [sic] browser" is sound and one we'd all do well to heed, if the market-share numbers make sense for you.
Smartphones still have headroom to grow 10 or 20x.
Can anyone find a link explaining the technology more? Going over their website I can't seem to find evidence of the product at all. Maybe I'm not awake enough.
A pre-paid phone somewhat similar to the once $300+ Motorola Razr is like $20 at Wal-Mart. If a low-rent Android device is priced similar in a few years, skinnyed down mobile software won't matter.
I went into an AT&T store for an unrelated issue and there was literally a line out the door for people willing to pay out insane amounts of money for a status statement. I had a Nokia 3620 or something that would stomp circles around the RAZR, & I paid hundreds less.
Here's an article about it, entitled "The Great RAZR Swindle":
In other words. That superpower is bound to loose it's status unless it's able adopt to that mindset.