I voted "No..."
Simply because it will limit the possibilities. And the very last goal of this game is to find one totally universal AI, which is an endless goal.
It does not fit well with the random map as well because random implies you have to take a lot of possibilities into accounts. I would be very unpleased if I were limited in nodes count and then seeing my bot not doing what I want to in some special case and not being able to do anythings cause my AI is "full" and already optimized for the most common cases.
In fact, making the AI limited make the game like "Make the most optimized AI for the most common cases", there is only one so once you reach it, "End".
The unlimited count implies that there is an unlimited count of AI, you can always find a better AI taking into account a new case. And as we have random and thus unlimited count of Map, we have as well an unlimited count of cases, and there you go for an infinite game lifetime.
I understand the remark and/or needs for easier gameplay for beginner so it is fine to create a special category or some tournament if it does not replace totally the real challenging category "unlimited".
You can't please everyone. If you set only unlimited category, you may lose the "lazy" players.
If you remove the unlimited category or make it marginal, you may lose the "brainstorming" players. You will lose me for instance. This is not a matter of intelligence, but really lazy/brainstorm way/willing to play.
What is the targeted community?
I think the game is made for the "brainstorming" category of player and whatever you try to do to ease the game, you will most probably still lose the lazy one for another millions reasons.