It was a VERY ROUGH estimation for a "worst case" scenario: ALL consoles, ALL games (one/month). Still it is within reach for almost everyone with a full time work in the USA and most parts of Europe, especially if you consider yourself a video game hobbyist.
Oh I agree, I think it's when kids are involved that it becomes alot more difficult as you really have to prioritise spending, but for the most part, there's no reason cutting back on something for a few months in most households wouldn't allow you to buy a different system to the one you currently own.
It's more a matter of priorities and really how much you want something, non of the consoles are particularly prohibitive in pricing. But then I paid out a bit extra for a Panasonic Viera plasma when they were still making the really goods ones and most people thought I was barmy to pay so much for a TV when I could have paid a few hundred quid less and got a crappy LCD which would have been "exactly the same".