I got rid of my unlimited since I was using about a gig or two a month. I have a 4 gig allowance and I have used almost two gigs between an iPhone, a Jetpack and the LTE radio on my iPad. I have not had the devices for a whole month yet but I can upgrade to 6 gigs for $10 more a month. I am also adding two dumb phones to my share everything plan next week, but they don't use that much data
It made more economic sense to go the share everything route. Your case might be different. Adding mom and grandma to my plan will be about half the cost that they are paying right now to AT&T.