If anything I think this makes it less likely to have Aerilate, specially considering the first time we will see these megas in a competitive setting will likely be on Champions, which the trailer implies will have Megas alongside Tera. It feels really pointless to give Dragonite a Mega just so it can click the same buttons as Tera Normal Dragonite (except now 96 BP and can be super-effective and is coming off of a mon with 100 extra BST)
Personally the suggestion I like most so far is Drizzle - fits with Dragonite lorewise, is the one weather without a mega and would give Mega Dnite something unique to do instead of being a strict upgrade