I'm sorry but how many guys will make it? Top 20?
It's not as clear cut as "make it" or not.
Taken from the Web.com Wikipedia article:
Also, starting in 2013, the PGA Tour's qualifying school grants playing rights only for the Web.com Tour. The medalist is fully exempt on the Web.com Tour for the entire season. Those finishing in the top ten plus ties are exempt through the third reshuffle, or thirteen events. Players finishing 11th-45th are exempt through the second reshuffle after nine events and all remaining golfers have conditional status. One can also earn direct access to the Web.com Tour through a top-five finish on the Order of Merit on PGA Tour Canada, PGA Tour latinoamérica, or PGA Tour China. The money leader from each of those tours is fully exempt and those 2nd-5th are conditionally exempt.
The little I've spoken with players on the Mackenzie Tour they start to figure it out there, but these reshuffles are all based on your finishes. Maybe some one with more experience than me can speak as to why the tours have adapted all these reshuffles? My .02 cents is that it seems to encourage the strongest field possible for every event. If you have a bad month or two, you're basically starting over.