I'm not sure it's a bad thing that the competitiveness of literary production will increase.

I think you're 100% right in regards to Shakespeare, but I don't think that has anything to do with e-books. Although many of Shakespeare's contemporaries are studied in academia, Middleton, etc. are rarely read by or performed for the public. The decay rate of net 'great literature' is a natural process. I do wonder though whether e-books will speed it up.