I think you are drawing a conclusion that is unwarranted. The topic is merely asking for favorite console each generation and on this site you will find many people who have been multi-console owners for many generations. Favorites changed, but it's not really a jump from brand to brand when people bought most, if not all consoles of any given generation.
Maybe I phrased it wrong. I like the fact that people weren't just loyal to a single company rather they just played what they wanted to play regardless of manufacturer. I buy every console myself (though I understand that's not always an option). I'm just praising the fact that many of us have open minds.