They won't and do not intend to because console version of Diablo can be played offline (understand without a livelink to game servers) so anyone can cheat offline and return online cheated. That would break game balance.
And it's only the first reason I found amongst many others.
On my side, I do not care of season challenges and rewards. On console, you can't change your portrait, so only the pet will be available. Also, I do not have time and take fun by playing hard during a 3 months timeframe just to loose everything (more or less) at the end and restart from the beginning.
I'm playing at the rythm I set, I set up my characters the way I want because I only play solo, I'm not having constraints with meta and narrow group roles, and so on...
Eitherway, even if by miracle Blizzard implements season on console, I won't play it.