Multi year scholarships have positive and negative attributes.
Pos: gives students a security blanket
Neg: that security blanket removes a lot of pressure to perform.
A scholarship is a salary. Just like with any other job, if you don't do your job you can get fired.
I see both sides of the argument. The South, being anti-employee, anti-union, and anti-pretty much everything else, would most likely side with Coach Miles point of view. So it is not surprising to see it practiced in the SEC.