Race organizations here on the Coast that have access to more than 1 track tend to split their season between tracks, with points counting to both.
I think the EMRA has to weigh the costs/benefits of doing this. In Washington, they have 2 tracks, and the tracks themselves provide the safety equipment like Stratotech does for you guys. It's a no-brainer for them.
If Castrol is going to require that the EMRA provide their own safety equipment, as has been speculated, then that's a massive cost just to run that track, when you already enjoy that stuff at Stratotech. I think any exec would be hard pressed to come up with a concrete answer to that.
It takes a LOT of people and equipment to run a race day successfully, and a lot of us in the background really have little idea of the amount of logistics that go into a day.