Usage does take on all the risk. The good thing about cloud compute is that it's recession-proof -- compute volume isn't something companies can cut.
However, their customers are not. I've helped several companies reach 80%+ reductions in compute/storage needs, which then translates into similar cost savings. No reservations needed, you have to provide deeper value and changes to achieve this.
> Usage does take on all the risk.
Seems like a great way to get 3-year commitment prices without the risks. Are you worried about assuming all that risk? What about abuse of this relationship by your customers?
There are plenty of blog posts around about that for X->Y