I completely agree with you about the term "sharing" economy. That term is certainly a PR victory for many of these companies.

This is commerce, and I would agree that a new, disruptive, form of commerce has been enabled by the web. There will be tremendous benefits, and there will be new problems and externalities. The old regulatory regime will need to adapt, but (in my opinion), this does not mean that zoning laws are now obsolete. Some laws are obsolete, others may be more relevant than ever.

Maybe "micro-commerce" would a better term? In any case, "sharing" is an extremely inaccurate and misleading term here.