There were rumblings from NBC Universal (their parent) that they were going to discontinue TRIO, so I am of the understanding that the DBS & cable providers are just being proactive.
I'm rather mad that DirecTV removed Trio. I would REALLY like to have that channel. That was the biggest decision maker for me switching from Dish, and then I find out it's leaving a day before my install. lol
And BTW, I just read a couple weeks ago in Multichannel News, that when Verizon FiOS signed a long term prog agreement w/NBC Universal, one of the many channels specifically mentioned being on the FiOS platform was Trio - makes you wonder if Trio is going to try to go it w/out D*.