It is way too early to bet on Fusion. Until they can create a sustainable reaction and harvest the energy this technology is still vaporware. It is always going to take a lot of energy to start a fusion reaction.. it is only in sustaining that reaction without adding more energy that we will see any real gains. Also, fusion will just be another way to turn water into steam in order to turn a turbine. It will be the fanciest steam engine ever made.