The top six (or seven if you include Everton) is a closed shop. It would take at least a couple of seasons of substantial investment to break it in my opinion.
top 6 certainly seems closed for the moment, wouldn't say 7th is closed as of yet but lot of clubs would be aiming for it in Villa, Everton, Stoke, Bolton, Us, The Mackems etc, and even then, The Europa League isn't exactly a huge draw for players