Are you familiar with research being done to infuse metals into plastics for 3D printing which then subjects the object to a form of radiation which hardens the object to near true solely metallic form? When the new energy sources are unveiled and oil/gas/coal are no longer the primary fuel for transportation and electrical production, the petroleum industry will be switched to produce nearly all the building materials for construction and 3D printing will be the preferred manufacturing technique, IMHO.
No. Source please? Sounds interesting and a lot simpler than laser fusion of metallic powder.
As to where the petroleum industry will go? It will follow the money. If alternative fuels reduce the price of “gasoline” or its equivalent, they’ll shift production to plastics, paving, pharmaceuticals, pesticides, pigments and other profitable products...