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I believe they are forever locked unfortunately or atleast that's what I believe to be in this case. I may very well be wrong but it is said that Mega Evolutions bring out Pokémon's true potential or something like that (don't remember perfectly how it was said in the games) so there wouldn't be a point giving them a new evolution as basicly Mega Evolution could be considered as a time warp to the past how the Mega Evolved Pokémon used to be in it's prime. Though evolution works in mysterious ways in real life too so there may be a change or then not to get evolutions to Mawile for example. But personally I highly doubt this and and think those Pokémon are locked forever unless they get some new Mega Evolutions and really good explanations behind them in that case why it's like that.
I'd like to see Swampert and Sceptile get one since Blaziken got one. I think a mega Lapras, Togekiss, and Arcanine. I'd really love to see Dragonite get one, but his stone would sound weird, Dragonitite