I'm not really sure what the trend has been with regards to market penetration of gold/platinum cards.
But as for public perception, I don't think most people actually cared that much nor did they ever care that much.
There has been a lot of people paying down their credit cards in the aftermath of the great depression for purely practical reasons (who wants to carry a huge debt if they face the possibility of being laid off) but I don't think the relative trendiness of actually having/using a credit card has shifted much. People have just been paying them down, not necessarily using them less or viewing them differently.
Of course, you're asking one guy to speak for 300 million people so I'm bound to be wrong. Just offering an opinion.