What originally helped to kill the "album" were the filler tracks, plus recycling songs so the same thing turned up on multiple albums. When downloads and such came along, we could choose to buy only the songs we want to listen to (1) and not the "other rubbish".
1 - mostly. I say mostly as some services (hello Deezer) have taken to replacing original copies of older tracks (mastered the old way) with shiny new "remastered" versions. I've yet to hear one remastered anything that improves upon the original.