I believe there should be six majors. The players should become one. The only negative is that it is at the specific course of Sawgrass, and too much like the Masters in that regard. There are enough major tough venues throughout the deep south in infrastructure rich urban areas to do this in May.
I think the sixth major should be in Asia, moved around, and be in late Oct or Early Nov. Like Jeff B states, some major financial purse needs to be put up by some collaboration of corporate or national State powers that be to commit to the first few years guaranteed purse to attract the best, and set it on a prestige footing in the world pro golfer community.
I agree the Oly golf will be like Oly tennis. Not that big of a deal, and weak field because they have to let a countries best players in, of whom they aren't nearly the top golfers internationally. Personally, I'm not past the idea of professionals playing in the Olys anyway. I'd love to see the Oly's a totally amatuer toon-a-mint which I think would elevate its prestige and impact more than another also-ran field of international stars from Upper New Bangalwala. Either way, Olys are not a major IMHO.
I have no beef with the whole concept of the PGA as it is now constituted, being a major. It is a top field of pros, and it is what it is, money-corporate-showcase that it is. It is a boon to the communities it is awarded to, in my understanding of the financial benefits.