How can renaming Bitcoin to something else to serve as a unit solve the problem of adoption, it's like starting over again, because many people who hasn't yet adopted Bitcoin won't deny that they have heard about the name Bitcoin or read about it and now you would need to explain further about the unit addition and then you have loose their trust before it even begun.

If this was the solution then countries would have changed their currency name to something else to tackle their economical issues, but no it's very fruitless.