1-A 2-part answer... The question isn't "Seattle, Vegas and Houston". Vegas and Seattle are in. The question is Houston. Trying to tie all 3 together is foolish. There is no one anywhere saying "We'll give you 50M more a year if you have Seattle, Vegas and Houston, but ZERO more if you only have Seattle and Vegas." As to what all 3 of them do for the TV.... Well, considering that NBC rarely shows games outside of the NE Corridor, I don't think it does much during the regular season. However, somewhere here someone said that the value of the TV contract is in the playoffs. If that is true, Houston and Seattle especially might tune in more eyeballs to the playoffs if they have a team in the league.
2-The matter was "why is Jacobs so excited about Houston?" My answer used Quebec as a prop only. I actually think Jacobs is selfish, single-minded, has surrounded himself with yes-men, and isn't seeing the future clearly. But, even if all of that is true, Houston is for sure the only place left which might do anything for anyone in the BOG (not talking about the local owners here).
3-We're back to the question of "How much does Houston itself increase viewership and thus how much NBC or someone will pay for broadcast rights?" The answer will always be, "A pittance compared to NBA." It doesn't matter which cities have teams. Think about it this way: Currently, you would say that NY, Chicago and LA, with Philadelphia and Detroit and Washington thrown in, are worth 200M a year. Now you are trying to convince me that adding Houston all of a sudden doubles the value of the contract? Or, even adds 10%? I really don't think that makes sense, but I'm not making the decisions for the broadcasters, either.
4-Your 'solution which makes everyone happy' doesn't exist except in fantasy land, in my opinion. Sarver and the Suns get all the ancillary money right now. They have the rights to that for another 5 years. Why should they play nice with the Yotes? They won't. Yotes have no leverage, since few in Phoenix actually care about them. The solution which most pleases most of Phoenix would be to keep the Suns. There is simply not enough winter sports money in that town to support 2 teams. And the Yotes are surviving right now precisely because of expansion fees. Sure, the league doesn't want to lose the market. But, at what price? That, of course, has been the question for about 3 years now.
5-Sure, Glendale cares. But, NBA, NHL and city of Phoenix sure don't. And, Glendale isn't paying the Yotes to play there anymore. What happens to GRA doesn't factor into the Yotes or the NHL's thinking at all.