Saul Smith @ Kentucky is a good example of what can happen in this situation.
Kentucky went from 35-4 and a National Championship in Saul's 1st season Where he played 13 mins per game, avg 2.5 ppg.
to 28-9 his SO season where he played 17 mins per game and avg 5 ppg
to 23-10 his JR season where his mins jumped to 29 mins per game and avg 6.6 ppg
to 24-10 his SR season where he played 29 mins per game and avg 6.8 ppg
So, his production certainly didn't warrant the minutes he played at Kentucky, no less. And the results are obvious in the W/L column, over that time period. Kentucky jumped back up to a 32-4 record the season after Saul Smith graduated. Now, either Tubby Smith didn't recruit elite PGs that a school like Kentucky always does or he couldn't get any of them to sign....because of his son playing PG.