Too many people don't know what they're doing late game.

How many of you have found yourself in an even game, or possibly one you are winning, when all of a sudden its mid or late game and your team doesn't want to group, focus objectives, ward, or hasn't been paying attention how they should be building or how the other team is counter building? I believe a great way to aid this problem would be to create a late game simulator, maybe as a new game mode. It would put both teams 30 minutes or more in the game with a huge lump of gold for each player. This way they have to pick their builds carefully in order to win, while also being forced to learn situation builds. Too often have I found myself late game and people are running around chasing kills, farming aimlessly by themselves or split pushing without a teleport at a time when there's a team fight about to go down. It would also help to show the importance of focusing objectives and working as a team to properly end the match. Finally, i think would also be a lot of fun being able to rush crazy experimental builds and try them out to see if they could possibly work. What do you guys think?