At this point, I really don't see why not. Peter's clone came back. The Jackal came back. Norman came back. Doctor Octopus came back. Aunt May came back. Chameleon came back. Mary Jane came back... Harry coming back to the spiderverse couldn't possibly delegitimize deaths anymore than they already have been over the last decade.
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>Plus, Harry could finally be given the spotlight as an evil, conniving bastard that can finally step out of his father's shadow and become a genuine threat to not only Peter Parker, but also to Norman Osborn. Really, the inevitable Green Goblin vs. Green Goblin fight would be amazing, especially with Spidey caught in the middle not knowing who to help (or even if he should help either of them at all).
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That is a brilliant idea. I would love to see the human chess game played between those two.

> And hey, if they choose not to have Harry be evil, at least Peter finally gets his best friend back and he can remain a long-term supporting cast member once again.
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Don't forget the family he's left alone the last couple of years in continuity time.