Disagree. I don't see that anything has changed in the balance. I.e. any new team that is harder to beat in 5 minutes than teams of the past. I feel GL Rey is and has always been the team you're really pushed for, on time.
Remember that putting a timeout team on defence is a strategy that with you're suggestion, you're trying to remove. I want teams that can potentially timeout your opponent to be part of my strategy case. If you can name one or a number of very new teams that are impossible to beat in 5 minutes, I might change my mind. However, I can't think of any.