7 Theories On How Arrow Will End
2. The Green Arrow Lives
'This is not his ending I foresaw,' The Monitor uttered with a little disbelief as he watched Oliver die in the bunker following his noble sacrifice, and with that, we were informed that things were panning out differently than expected. That revelation, of course, suggests that the pieces are always moving on the board and that anything can essentially happen going forward.
While it's highly likely that Arrow's conclusion will deal with the end of the Emerald Archer in some capacity or another, there's always the chance that these changes will allow Oliver to return to his life as Star City's protector. Sure, it might sound preposterous given how the season has built up his demise and set the stage for his successor, but it certainly wouldn't be the most ridiculous thing the show has ever done.
If Mia returns to the future to team up with the Canaries for the spin-off, that will leave the present without a Green Arrow, so unless the remaining members of Team Arrow resume their outlawed-unless-working-with-the-SCPD personas, then there are no vigilantes left to protect the present. With that in mind, Oliver might just be continue his vigilante activities for a few more years to come - albeit off-screen.