With the evidence provided by WotC that nearly nobody plays above level 10 and the lack of interest for playing squishies at level 1-3, isn't the logical conclusion that the whole model zero to hero (1-20) isn't satisfying? Shouldn't they drop the concept of advancement and focus on the 4-9 range in term of power? After dropping classes and stats, I feel that the cumulative changes wished for would lead to a very different game.