Longterm, are pills both cheaper to manufacture and distribute than injectable? It's tempting to assume so because of not needing a mechanism and production line processes towards pill encapsulation. About the only possible advantage a liquid would have is flow state manufacturing and avoidance of drying cycles somewhere in production. I can't see that outweighing the cost of the injector.
Cost, and price are of course fully disconnected here. I look forward to Indian and Canadian generics in due course.