The debate on whether renewables can account for 100% of society's needs has already been settled, apparently[1], and the answer is clearly yes.
- What amount of natural resources (lithium for batteries, neodymium for wind turbines, ...) would be required, where would it come from, how would we transport it using renewable energy, ...
- What's the EROI for each renewable energy source? Would it still be profitable if there are any unexpected maintenance costs or externalities?
- Your link mentions "unsustainable energy consumption" as one of the issues, does that mean the transition will involve increased energy poverty?