I think that the PBA name itself says it all...."Professional Bowlers Association". The PBA name makes no mention of gender in the title, so I don't see a problem with the PBA creating a women's division within the organization itself. Besides, it could prove to be a good public relations selling point for the current PBA itself. I can eventually see where the PBA could include the men's regular tour, the women's regular tour, as well as the seniors division too! I don't see any major roadblocks stopping such a structure from happening, other than the big 3 owners of the PBA deciding to wander off into such a venture. In the end, I think that all 3 divisions falling under the "PBA" umbrella would be better for all involved, including the PBA owners.
Eventually at some point, the ABC, WIBC, and YABA ARE going to merge into one organization. It may not happen this year, or it might take another 10 years to happen, but inevitably it WILL happen. So, I don't see the problem with the PBA doing something similar. In fact, if the PBA jumps out and does it first, it might speed up the process between the ABC, WIBC, and YABA.