It seems quite likely that the Yamaha reorganization might have something to do with the rules changes in GP. Now that Yamaha's #1 rider is in GP and four strokes are soon to be involved the resources are probably going to head in that direction. If they do develop a 4 stroker for that series it is going to be quite expensive and time consuming. Contrary to what many believe resources are not unlimited. Just my 2 cents worth.