I think I read an article here a few weeks ago that talked about MUSL and the Mega Millions Group putting on presentations for the Texas Lottery. Sounded from the article that MUSL (PB) had a better presentation.
While it is true that MM is in the bigger population states, the fact that the jackpot has not grown that large since the new ball set started, may keep Texas away. The states all want big jackpots, and so far, PB is the only game that has delivered.
I have a feeling that this will all be moot in about 5-7 years, cause in my opinion, MUSL will absorb MM and we'll have a true US National Lottery (to go along with whatever International Lottery game they cook up).