Bitcoin will be on the way out. It's old and inefficient. Others will take over eventually. Proof of stake and hybrids also help to address the energy concerns. Which are just a bunch of hysterics anyway. It's not a problem now and we don't know for sure that it will be down the road. As for quantum computing it is a legit concern. There are some projects trying to develop quantum resistance however it remains to be seen what will come of that.