I think it's a bit of a silly question though. Obviously the answer will depend on the ability/ceiling for each player and what they're interested in. It may be different for every player.
It's like asking what high school graduates should aim for next: university, TAFE, apprenticeship, unemployment queues, masses of money, etc. Is the correct answer they should all aim to immediately start businesses that take over the world and make millions? Or should it take into account different interests, ability/aptitude/etc?
Players might not know that until they've completed their AIS stint. They might also not get the duration they hoped for and be released without renewal.
What they do next may also depend on offers and interest they get. There is no one true path.
I mentioned college specifically because of your inference that maybe the AIS wasn't pushing athletes down the college route (covered on Hoops many times before) and, yes, because I know you have a particular interest in athletes taking that college road.
The question about college vs Emus (if they are exclusive) is better, or a question about the best path between AIS and NBA, or asking about the percentage of AIS players that end up in each different league.
Of a few of the players that were at AIS with my brother, I think it's roughly like this (might've forgotten someone):
Schenscher - College, NBA, NBL
Mottram - NBL, lower Euro leagues
Carter - NBL, Sweden, NBL, Sweden
Crosswhite - kicked out of college, then NBL
Forman - NBL
Holmes - NBL
Cameron - SEABL (can't remember if he played college or any NBL beyond tryouts)
Thompson - Div 2 college maybe, possibly some QBL after?
Wright - NBL briefly, not sure what else
Caporn - NBL, coaching in college? Might've played some WA ABL?
Tatulli - don't think he played pro anywhere; I remember being surprised
Philip - NBL benches and ABL for a bit