I thought there was a shortage a few years ago because of the Tsunami. I think the lack of product for those few years created the shortage of certain year bikes. I haven't seen many GSXR's while out riding last year, but then again I do not ride in the GTA, except to get out of it.
Others have said other brands are making bolder moves with their products, so that could be a real reason. I have owned several other brand sport bikes, and I returned to Suzuki because to me it felt like an old baseball glove, and not as cheaply assembled as some of the other brands I tested. It felt perfectly comfortable right out of the box for me. I ride AGATT, even if its 38c. I saw no other 2015's last season, but I am sure they are out there.. ran into a bunch of people with 13's, and 14's..
Question for anyone who may know.. Would modifying my bike (getting better levers, quick shifter, PCV, adjustable clipons) void my warranty?