I can see them stretching it out for quite a bit - after all it’s a HUGE roster of classy villains, they can juggle them around for ages. Penguin took up most of this season, it’s easy to see they could focus on another one next season, and so on.
Great chemistry between McKenzie and Baccarin. Loved the teasing of Dick Grayson as a twinkle in the eye of the carny couple. And the Joker teaser was really well done, I thought, allowing the actor to give his own little spin to the character (quick shifting between serious and amused). Just all-round good fun.
I wonder though - they might just be able to pull it off. David Mazouz is 14 now, and he’s a great young actor. If they manage to stretch Gotham out to 4-5 seasons, he could be 18-19 by that time, feasibly old enough to don the cowl for the first time, at least as the original detective style Batman, starting small, and the show could morph into Batman.