The first post says:
"Even after the transition, T-Mobile HotSpot and HotSpot @Home customers will continue to experience seamless Wi-Fi access at Starbucks locations for at least the next five years under a roaming agreement ..."
Tmobile Statement
So at a minimum, those with H@H would be able to use UMA for at least 5 years. Tmobile could maybe cut off regular UMA, but its probably easier just to let it continue.