Unless I'm misremembering (not watching it again, haha), he also said "Oliver could be dead, the show could be canceled" or something along those lines. He didn't just say that the question asker should be glad Felicity's still alive-seems like he was just pointing out that in the grand scheme of things Oliver and Felicity not being together isn't that big of a deal.
I do agree that it is tone deaf given the complaints about the show, and wasn't the best example to use.