I don’t doubt this at all, but I suspect it will extend to all aspects of software, including the OS — it is the inevitable state of full decentralization. However, I expect also that the usage of software in being metered will also be countered by in-kind contributions, in that the power you feed back to the decentralized grid will compensate your use of the software you need.

Disclaimer: I am working on exactly this notion of a decentralized PaaS