Would be interested in how this would work because teams going up aim to add four or five players of real quality before season starts and teams coming down aim to lose that many to ease issues with wages. Then you have exceptions such as Wolves who were able to add quality while still playing in Championship, Fulham who aimed to add eleven players of greater quality but was probably a significant reason for their struggles, or Newcastle a couple of seasons ago who stuck with a Premier League squad when relegated to Championship.