The Crypt Lord buffs would suggest that Blizzard want to see a wider range of heroes being used.
Here’s a very simple suggestion, which should have been implemented long ago.
Why not allow players to assign heroes to different F keys?
When unusual heroes are used, or a different hero is used, this can be painful for the player because it creates confusion with the F keys. Letting players assign heroes to different F keys would encourage players to experiment more freely with different hero orders, and different heroes.