What will influence energy as a whole? Without any doubt the gas factor (and everything that relates to LNG). ). Relation of profitability of using these or those hydrocarbons will be determining volumes of production. Shale gas and possible production of liquid fuel from coal in industrial volumes will also exert certain influence. In the end so called alternative sources of energy: low carbon, hydrogen, nuclear, solar, tidal, biologic, wind and so on will not stay aside.
I categorically disagree with a widely spread manner to counterpoise different sources of energy. Each of them occupies its right place (some very small yet), but in the future will occupy, one might say, a reliable stationary niche.