Not just I-15, but TRAX. They just nearly doubled the size of the system and I'm pretty sure the main reason the entire network exists is to get people to and from Jazz games, isn't it?
That's technically the reason... I don't think Larry H. wouldn't have put his support behind it, unless it was gonna help keep filling up the seats at the DC. And Miller's support was probably the major push to get the trax ball rolling.