Well then the problem doesn't lie with the after effects of CT and TIE. It's more the term 'Enthusiasm'.
I agree to this. The term used currently is misguiding (IMO). Perhaps 'Team Morale' (or 'Team Spirit') is better, as telling your players to 'play their best game' (CT) more than once in a short timespan would wear the team down.
I tend to agree to those that think this adds to the strategy part of the game. I like the idea that a smaller team can bring a big one down if the latter decides to TIE. However, the concept could use some rework.
What if you took TIE completely out of it, like in the final rounds of tournament/playoffs? I mean, if you wanna take it easy, you rest your best players, not? Then it would not be possible to accumulate enthusiasm.
...and what if CT affected your stamina (short time) and game shape? It even could affect your chance of getting injuries (playing harder, trying the impossible)? It would certainly make me think twice about using it.
Game results could even affect enthusiasm. Losing games could bring it down. Losing to weak opponents would hurt even more - oh, the embarrassment! Winning would boost it, though only significantly if you beat stronger opponents or won important games. If it worked that way, you could even keep the option to TIE, as you would run an obvious risk of hurting enthusiasm more than you would gain.
Anyway, let's see what effect the announced all-star-break modification have!