Combination of many things - a lot already thrown out there, plus the skill of college basketball players & teams is not what it once was. When I say skill, I mean the skill of getting the ball through the hoop.
The college game has been diluted, mostly due to young players leaving early or jumping straight from HS to the pros. Coach K mentioned how college basketball is not being played at the same level as it was in the 1980's on the 30 for 30 piece on Valvano's NC State team.
The same thing is repeating itself that led to the changes in the game that occurred in the 1980's: team's used to 4-corner once they cemented a lead in the 2nd half / bring on the shot clock; after Valvano's run in '83, teams began to foul like mad at the end of the games to have a chance to come back when the game was prolonged / bring on the double bonus; big men were too dominant (reason why the dunk was dissallowed until the mid 70's) / bring on the 3 point shot (believe the first main conference to experiment with this was the ACC - just so happened to coincide with the time Ralph Sampson was a dominant force).
Now, the teams with less talent play very deliberate & limit possessions. More physicallity is being allowed on defense for all sides. Combined with less talent overall, and it is a perfect storm.
