Couple of problems with allowing tour guys IMHO...
1. The pattern isn't being announced, but players can practice on the showcase lanes and Bowlers Journal Tournament and have greater access to drill balls onsite which isn't really cost effective for the average bowler. So you're already at a disadvantage because they're the best bowlers in the world, but even a good bowler is picking his best 6 balls with no knowledge of the pattern and hoping he matches up. If they really want to level the playing field, shut down the showcase lanes and don't allow players to enter the Bowlers Journal until they have completed their open championships competition.
2. The elite players in our sport already have a tournament sponsored by the USBC, it's call The Masters. If I wanted to compete against touring players, I know how to sign up...but I know how good those guys are so I save my money.
3. As you said, we now have another division thanks in large part to the addition of the touring players. I guess we will have to wait and see, but in all likelihood the prize fund will be watered down.
I have no doubt you will see an increase in entries because it's in Vegas, the next several years will tell the story but with the continuing decline in membership, the pool of members to draw from is getting pretty dry.