What do you think will be the most in demand and important products, materials, and resources sourced in the next few years?

Definitely, cloud services are moving to the forefront with each passing day.
So cloud services likes business as a service, hardware as a service, platform as a service, software as a service will all have mainstream demand.
FMCG - fast moving commercial goods will always have demand Green & sustainable technology - As more focus is placed on renewable technologies with lesser carbon footprint, the demand for green and sustainable sources of power generation will rise

Food business and electronics