it's not as easy as that, and not very new idea. Some RIRs (Regional Internet Registries) do not allow that. you would need to find some legacy space to do it, which it may be hard. and then some buyers. also you only have a few years to recover your investment, by the time ipv4 is finished (not the IANA pool, but the actually stock from rirs), probably ipv6 would be a reality.

i think is a good idea. the final product is not ready yet but it is a step forward for ide development. It could also boost collaborative work among developers and it might improve security and availability(keeping the code away from the developer desktop it easier to backup, avoid code stealing, etc.)