Call me crazy, but I would like to see cheaper voice plans with fewer minutes. I was previously on the lowest individual plan and had a ton of Rollover minutes and then decided to add a few family members on. We share 700 minutes/month and apart from mobile-to-mobile between us, there just aren't a lot of minutes used.
If we were able to get a voice plan that had, say, 400-500 peak minutes/month for $10 or $20 less, I'd be inclined to spend more on larger texting plans for two of the lines.
I think there is definitely a shift from voice to text/data and by requiring a certain voice package to start with, some people are passing on the options to save some money. I know, it's a phone first, but I think a lot of people are like me where the "extra" features get used more...and I don't even text much.