AT&T Unlimited LTE Hotspot $20 without AT&T phones

I went with the 2 yr. option. Anyone have any insight or inside info. as to whether this truly unlimited plan will continue to be available for a while? Say 5-6+ yrs? Or is it a one-time thing?

It's been a huge boon to our lifestyle. My wife is now able to work from the road on Thurs's. and Fri's. Rather than waiting til she gets home on Fri., we can now be ready to head out Wed. night. Basically giving us 4 day weekends. Sure hope ATT keeps this plan around for a good long while.