It's hard enough to sell the idea of a distributed cryptocurrency without also needing to explain that we need more than one of them to get full functionality.
Who says you need more than one currency?
The cluelessness in this thread astounds me. How do people manage to keep repeating the same factually incorrect claims after they've refuted in allcaps?
Call the "other layers" whatever you want, but if it turn out the scalability restrictions on the blockchain are not lifted people are going to look at the
wiki, and look at the threads talking about this and conclude they've been taken in by a bait-and-switch. Bitcoin is not being advertised right now as a base settlement layer that the average person will never be allowed to interact with directly but instead will be required to interact with a third-party entity who is privileged enough to use one of the 200 million permitted transactions per year. Bitcoin will not be served well by the appearance (justified or not) that vested interests want to keep the transaction rate crippled in order to promote their pet projects and alternative cryptocurrencies.
The worst thing that can happen for Bitcoin is for scalability solutions to exist, but not be adopted for political reasons.