jonahgparsons,
Yes, people still play Simcountry. No, fearless blue is not a dead world.
Corporations having unsold products doesn't mean there are no buyers, just that there are more sellers than buyers, for that product. Also, it can be caused by having a selling strategy that demands too much for the items you're selling. Personally, I find "Best Price" works quite well.
If your purchase orders are unfilled for a long time, there is probably a shortage of that product. If you are in a hurry, replacing your order with an "immediate" order, should help you get the production plants you need, otherwise, the order should be filled, if you give it time.
Signed President of DanNation on LU