When there's no cash in hand then what will folks do if/when something crashes (like the grid and the economy)? Please, please....we need cash, we need coins (silver and gold), we need to barter and trade, we need to make our own local currencies.

I use plastic and cash. I even still write checks for bills. (I also don't own a smart phone but an older model flip phone.) I just don't think it is safe or healthy to ONLY use credit/debit cards. This is a recipe (yet another) for disaster.