Apple seems to not want to get into the prosumer market because it is a tiny fraction of the size of the general iPhone/iPad/Beats consumer market. The buzz about future Apple products seems to be about things that could achieve that sort of scale. (TV, watch, something video game related, etc)
Their prosumer computers essentially only exist so that developers can enrich their mobile platform. Growth is essentially flat on the Mac line, whereas iPhone sales have grown steadily since launch.
