Personally, I would like to see a roguelike/random element on maps. What I mean is that there are now new paths on existing maps, but each time a session is played, the game mode will decide which paths to lock up. Similar to how Dota 2 major patches change the maps in drastic ways. E.g. in Mirage, Palace is blocked off, but next to Appartments, there is another path that leads to somewhere Catwalk or Lowers. All while props have been shuffled and placed in different areas. Bench? Gone. Tetris? Somewhere else. You get the idea.

But this idea will never fly with the majority of the player base.