No gas wars. Payments will be ranked by the time they were sent, not the time we received them
What will happen if someone puts out a low gas price and his transaction remains in the "pending"?
After the gas price reaches the normal values, this transaction will be executed. I do not think there will be any problems with the ETH network for longer than a few hours. There is another option that the price of gas is generally small - in this case, if I'm not mistaken it is canceled over time itself.