Converting From many subnets to few

I work at a college that presently has 30 subnets for a campus of only 1200 machines. The old admin tech belives every building should be a seperate subnet and vlan (which he placed acl’s on each) even though it is all student and faculity that needaccess to all. I was thinking that one large subnet or only two subnets and have open access. Does anyone have experience in this?