I think vinyl has limited the music due to the economics and the accessibility of the plants required to make it. If you dont have access to plants that press then it is hard to get pressed. The economics come into play as you need to press about 1000 (?) in order to cover costs and make profit from the release. So chances are not taken when the decision is made to take on an artists work. The label wont risk a pressing if the artist is 'different/experimental' or little known.