I understand this, I'm just saying you can't just discount it as if it doesn't matter. The whole reason contraction is occurring is because all those (much more profitable) consumers who bought Wii's last generation aren't buying any consoles today, and that fact is invisible on your chart. There were a lot of those consumers, and those consumers were highly profitable, and they've been scooped up by competitors like Apple and Google and lost by the console manufacturers.
In other words, we aren't just losing a random sampling of consumers from the console market, we're losing the most profitable ones first, with the remaining "core" gamers typically offering far lower margins. That's a problem.