Actually had a similar idea for creating a token for hedging fluctuating gas costs. If a token similar to the SOV had no limit to the supply and minting was not constrained (only by fixed gas requirement per unit), then price on exchanges should go up and down with the current gas price. Not sure if it would attract enough trading to create enough liquidity but theres futures markets for almost everything so why not? If wallets and dapps would integrate trading with such token they could enjoy predictable gas costs per tx 

Samsung, buys new when old one gets too damaged, which takes a few years. Use it for everything!