I don't think we will run out of gas before we switch to renewables. The supply of gas (as in, the amount of gas that can be produced per month) is limited and the demand for energy is always increasing, so prices are always going to go up. As new technology develops, and with economies of scale, renewables are getting cheaper. I think we'll get past the tipping point where renewable generation + storage is cheaper than fossil fuels well before we actually run out of gas. Being inefficient with our resources (like burning gas like this) means we'll be much worse off when that happens.