The Future of GPS and no unlimited everything plan?

Hi there 

Its interesting that phones are getting bigger with bigger screen realestate  plus phones are becoming (if not already) our go to device on the go.  i don't know if GPS apps on phones are still a new concept?

i understand GPS uses Data so why doesn't ATT offer unlimited Everything including Data plan so we can use GPS without worry?  i understand unlimited Everything is "grandfathered" in.

as ATT customers we should have a "worry free"plan where we can use our phones using as much usage as we want or need.

i know that other carriers have unlimited everything but i very happy with ATT.  

i just wonder when phone/tablets will replace standalone GPS navigation?  do you know?

Thanks!