Quesada has sales on his side.
Like heck he does! Even allowing for the "speculator bubble", Marvel comics in the 90s typically sold at LEAST twice what they do now.
and? Comics sold more in the 1980s (leaving aside the collector bubble of the early 1990s) and more in the 1970s and more in the 1960s. Even when Stan Lee was at his peak, his comics were selling more than the previous decade. You cannot look at sales numbers devoid of context.
Every decade brings more and more things for people to spend their disposable income on - entertainment has fragmented.