I don't think getting people to stop watching UFC is anything that's going to happen in the immediate future. Maybe 20-30 years from now but that would be a long term type of goal for PFL. For now what they can do is increase their production values, make their events easily watchable, do more in marketing, and have a faster pacing of the cards. Just common sense things they can do to make their product better.
They need to ditch the tournament format now they have a much better roster. The last event I watched had boring decision after decision until I just stopped watching. Perhaps making some fights mismatches to get finishes will get more people watching. I know that's kind of cheesy but it is what it is.