The problem with college baseball is 11.7 scholarships. You can spread that out over 27 guys with minimum of 25% for each scholarship player. Bonus pools in normal draft years have gotten pretty hefty. Kids getting drafted in the higher rounds are still pulling 6 figure bonuses. Kids that go to school look at 3 years and say will I go from a 125,000 signing bonus to a 2,500,000 signing bonus. Or the next thing to consider is how long before I can make a major league roster. Minimum is 545,000 per year but you have to be on the 40 man roster to make that money. Then there is also the endorsement money. I know that is coming to the NCAA but the baseball kids make most of their money off of shoes, bats, and gloves. I think there is a carve out if a university has a contract with a shoe company.
The next 2 years are going to be very different. If there is only 5 rounds this year then the drafts for the next few years are going to be stacked. I can see lots more kids going to college with the hopes of improving their draft status and bonus money a few years down the road.