There are a lot of factors that could go into this:
Does Dinos stay?
Does Collins put on the upper body weight/strength to bang down low for 25+ minutes?
Does Collins learn how to stay out of foul trouble?
Does Moore develop into a guy that can play 15 minutes a night?
How good is SJM right away?
He can be "replaced" in a number of different ways, but we are trading a sure thing this year for a lot of question marks next year. The productivity will also be comprised of a lot of different players.
The starting lineup for next year (if I had to guess right now) looks like this:
Crawford
Woods
Watson
Dinos
Collins
Manning likes a three-guard lineup, and Watson/Crawford should both be able to stay in front of their man at a decent clip. Unsure of Woods defense, but we know what we have in Dinos, and Collins will likely improve.
There is shooting all over the court there, and we can bring Wilbekin/Hudson/McClinton off the bench.
We may start Wilbekin since he will be a junior, so just replace Woods with Wilbekin.