It's only commercially feasible if SpaceX is willing to sell that service. They are pretty firmly committed to the philosophy of reuse. They have to fly expend

It's only commercially feasible if SpaceX is willing to sell that service. They are pretty firmly committed to the philosophy of reuse. They have to fly expendable now, because customers can just fly on Ariane/Atlas/etc if SpaceX said no. Once Falcon Heavy is flying, there won't be any competitors with the same payload capacity (until New Glenn, which is also planning first stage reuse, but is still very much a paper rocket at this point).