I'd think parts should be available for some time, when I was employed in bike sales/servicing on the rare occasion we had to supply/fit a complete engine via factory warranty we had to order/buy every single component individually and build the engine from scratch, the parts were always readily available but it wasn't possible to buy a complete engine even as a franchised dealer, having a complete engine would have been more cost effective too labour wise for everybody with warranty purposes, having said that I don't know how long parts have to be made available for retail after the original inception date for the model.