>>150019531
Also:
Bruce has a chronic problem with being a moody loner. But he also has a soft spot for troubled kids. Him begrudgingly agreeing to help Terry is rooted in both his obsessive crimefighter streak and his desire to help people, to prevent anyone else from having to suffer the loss that he did.
Paradoxically, he's one of the most likely heroes to do the whole 'yeah I'll make you my successor' thing.
The world being set in future also allows Bruce to have his own little arc of dealing with being... outdated, so to speak. His villains are dead or retired, his sidekicks grew up and left, he's too decrepit to be Batman, and the world itself is completely different physically (from tech to architecture).
Also, the series benefitted MASSIVELY from being original AND not being a guaranteed success. Writers could kill off their villains and not be obligated to bring them back unless they wanted to. Characters came and went as needed, self-contained storylines too.
Of course, there was its fair share of meddling, which lead to Max being a recurring thing and later episodes being more teenager-focused, but that's small potatoes compared to what other series endured.