Is it really more important to have new AI3 than to have new cards, T500, or a fix to desync?
I think not.
Besides, by the time players get bored of AI3, they should have the skill and resources to take on T50 or AI5. Or they could play PvP, which I prefer more than any AI.
Lastly, there are those that grind AI3 for score, but they will get bored of new AI3 quickly.