[npoc]

It will happen once bitcoin has proven itself as a store of value, new layers have been built on top of it and matured and have acquired a large user base with network effect.

Right now we already have proof of concept of a decentralised micro-payment network with Lightning. But it won't gain widespread adoption until more people have bitcoin, so much that they'd like to start spending it rather than buying/holding it (see Gresham's Law), its value has stabilised to a point that it can be used as a unit of account, and shops are therefore willing to price their goods/services in it.