Zardnaar
Legend
I'll remember 4e as the edition where everyone was effectively a spell caster, the edition of non-sensical purely "gamist" rules (fighters have techniques that can only be used once a day? How in the world does that make sense), the edition where simply swinging a weapon was never the right choice - instead it was better to use the twisted lotus ninja decapitaiton strike power.
The world will remember 4e as the edition that did so poorly it was cancelled a full year before its replacement was released. No other edition of D&D has that black eye, and hopefully it will never happen again.
2 years before 5E. I do not think iot will be remembered for anything good. On life support 2 years in, replacement announced 3.5 years in and DOA for 2 years until the next edition. Depending on how 5E turns out it could also be blamed for the beginning of the end.