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Heres a debate, can a stage 1/2 Pokemon with a Mega evolution receive a proper evolution? To me it seems like mega evolutions were intended to be the end of the line, such as what we see when stage 3 Pokemon Mega evolve. Will see Pokemon like Pinsir, Heracross, Absol, etc evolve in the future (without retconning megas just to be the proper evos)
Obviously they can get baby Pokemon but a Pokemon with a Mega that goes on to evolve to stage 2/3 might seem weird with the fans and Gamefreak. But then again we see Pokemon Gigatamax such as Pikachu and Meowth even though they have an evolution after that, so it might not be so weird if they do it with Megas.
Its also possible that Pokemon get split evolutions that eventually get a stage 3. Scyther's new evo could go on to evolve to stage 3. Or we could see Slowking evolve while Slowbro remains the one with the mega.