Most maps are bugged and most people who play dtv exploit terrain. DTV is outdated and non-fun thanks to it. People don't want to fix it, they want easy experience. Therefore, removing dtv and replacing it with more entertaining cooperative game mode wold be great decision.
But then, if you say "cooperative", you are talking about players fighting bots. Am I right? Even if it was Defend the Village, bots would still get stuck on those maps.
The fact that you don't like it doesn't mean everyone else thinks like you. There are many people like me who like this gamemode.
But, please, feel free to suggest something new!