Yes, fantastic episode. Acting great on everyone's part. Though, I can see the predictable Oliver "I can't protect anyone I care for" dumping Laurel to drag the "will they, won't they" out, after what happened to Tommy. Of course Laurel won't understand that, and he'll be back to jerk Ollie in her eyes.
I'm guessing they'll be having Roy forge his identity in the destroyed part of the Glades. It's only a small portion destroyed though. For second I thought, "no they wouldn't would they? Destroy it all?" I could have seen a Batman No Man's Land type story. Of course they've already told us there's a fault line there, and damage has been done now. Wouldn't surprise me if further damage is done in much later seasons for a No Man's Land.
So anyway, Merlyn succeeded were his master (presumably Ra's) failed. I like to think a similar scene to this was playing out in Gotham (sorta like Begins) just to acknowledge the wider DCU.
Next season? Ted Kord. He's been mentioned, and charity wise too. Could see him helping to rebuild the Glades. Deathstroke. Flashbacks will be about how him and Ollie turn on each other, with them duking it out in the present. More Deadshot and likely a sponsored government assassin team. Ollie/Diggle will NOT be pleased. A foil for Smoak? Maybe Calculator? In the past flashbacks? that "almost" hit has to have been checked by the Chinese government. Wouldn't surprise if we saw some more realistic members of China's Great Ten. I think after what happened, the shock will hit peoples psyches and the villains/heroes will start to come out of the woodworks. I think by season's end, the good guys team will have fully banded together to finish whatever the season's threat is, with an evil Secret Six/Suicide Squad put together for the next season.