Two things happened to rollerblades.
1) Errybody kept busting they ass on 'em. I know too many dudes who got the shyts and never kept up with it and just let 'em dry rot in a closet somewhere until they got tossed back in the early 90's.
2) shyts was expensive as hell back when the boom was happening so if you fukked up a blade or a wheel on one you pretty much had to do without that shyt 'cause your folks wasn't gonna buy you a new one and you wasn't wasting a christmas/birthday present on shyt you done had before.
The majority of us that could use bikes, just kept with the shyts since you ain't had to have nothing more than a can of oil and one of those chain setting tools to pull the chain down to the low gear if it ever slipped and you was good to go.
