Rick's teams have rarely been a great 3-point percentage team (1996 Kentucky was, though). He was just so ahead of the curve re: the three-point shot, that because his team took so many more than their opponents, they got more points out of it.
The "bomb squad" Knicks of 88-89 were only 7th out of 25 in 3 point percentage, but they were first in makes and attempts. The percentages that year, of the guys on that famous poster, were:
Trent Tucker - 39.9 percent (he's really the only guy of the five that I would consider to be a "shooter")
Johnny Newman - 33.8 percent
Mark Jackson- 33.8 percent (slightly less than Newman when you extend it out)
Rod Strikland - 32.2 percent (only 59 attempts, though)
Gerald Wilkins - 29.9 percent
Those are not great percentages (except for Tucker). They did however, attempt 423 more 3's than Sacramento, and made 79 more than the Kings (who finished second in the NBA in both categories).
So, the days of Pitino being a "great 3 point shooting coach" (if he ever was one) are probably over, since the differential in the number of 3's his team shot, compared to his opponents (even going back to his Kentucky days), are not likely to happen ever again.
Now, do you want the good news? His 2013 National Championship Louisville team (the NCAA can refuse to recognize it all they want too), was 214th in the country in 3 point percentage. They were also sub-200 in three pointers made and attempted per game (their championship run though, meant they played more games, and were top 100 in total). When they beat Duke by 22 in the Elite Eight, they did so despite shooting 2-16 from 3 point range.
Also, his 2015 team, which fell in overtime in the Elite Eight, was 311th in 3 point percentage (out of 351). They were sub-200 in attempts per game, and were 258th in free throw percentage (mostly because Montrezl Harrell had the most attempts, and he was just under 60 percent - all the other main foul shooters were good).
So, Rick has shown the ability to be successful without using the three point shot as a weapon.