The price is based on utility of the commodity and speculation about its future utility, not mining costs. Put another way: more hash power does not raise the value but more value may raise the hash power (by making it profitable for less efficient miners to mine).
> how a structure on top could be created to leverage bitcoin without mining.
There's lots of activity around alternatives to bitcon's proof-of-work based mining: proof of stake, proof of activity, etc. Just search "proof of work alternatives"
Bitcoin is not necessary. The environment is. Easier solution is stop operating a power plant to play speculator on play money.