Is Localism a sufficient focus for Intentional Currencies?

There are good reasons to want to improve the health and diversity of your local economy. But should locality-based currencies scale, or perhaps replicate - networking micro to build macro (HT @cjenscook)? And is localism enough or is there a role for limited-scope value-based Intentional Currencies? @GrahamJBarnes anticipates some architectural aspects of a new monetary ecosystem.