If you look at the bigger chart further down the page you can see that the market for interchangeable lens cameras is still a lot bigger than in 2003 or even 2007. Full frame sensors are getting popular and able to fetch higher prices.

Meanwhile I have a camera body that was introduced at the end of 2012 and it's working just fine for photos and Full HD videos. I'm in no rush to upgrade, my guess is i'll keep using it until 4K60P video capable interchangeable lens camera bodies become more affordable, perhaps in 2021 or so.