Nothing can replace conventional oil, gas, and coal.
Several studies indicate no more than 200 million Americans could be supported at a decent standard of living on solar technologies. In other words, the party is over. Overall, uranium is relatively scarce in the earth's crust, at about 4 parts per million on average. These supplies include both deposits previously exploited but mothballed due to lack of current demand, and known high concentration pockets that could be opened up quite quickly.