Re: 8 years of no Batman or Bruce Wayne, and NO ONE could pick up the trend?
Yes. I read the clean energy project as Bruce's attempt to move on after Batman became obsolete. It let Bruce channel his energies into helping the city, rather than wasting his time in the cape and cowl and lingering on what's past.
"I never asked for this crown. Gold is cold and heavy on the head, but so long as I am the king, I have a duty … If I must sacrifice one child to the flames to save a million from the dark … Sacrifice … is never easy, Davos. Or it is no true sacrifice." - Stannis Baratheon