Most D-1 Scholarships are renewable annually . They are only guaranteed for 1 year. Did the NCAA modify the rules recently ? YES . But that only applies to very small number of schools . There are 300 D1 programs . Most aren't even fully funded ( 11.5 ) .... Put another way only about 35-45 schools were fully funded last year.
As far as guarantees and cuts. As was already mentioned NLI money is guaranteed for 1 year. They can't take that away from you. As far as baseball goes , The only guarantee is that NCAA coaches are going to roster spot guys that they believe can help them win . Period.
Look at it this way, NCAA D1 ball couldn't survive without non-baseball money academic money guys . Coastal won it all 2 years ago with 5 starters that didn't have any baseball money.
The point is there are no guarantees . A baseball scholarship gets you a ticket to the dance. Nothing more . And when you get there the dance floor is FULL . Guys have to perform immediately when they get on campus for fall ball. And generally , that only buys you a playing option. Meaning , you're an option at your position because freshman don't start at quality D1 programs . Or let me rephrase that , 1 or maybe 2 freshman might start out of the 9-10 that are coming in to the program. Freshman learn how to sit their first year. And if you see maybe 20-30 AB's your first year consider yourself lucky.