Lightning network is just the first example of what can be done building on P2SH with payment channels.

There are sure to be more innovations using Bitcoin's scripting/contracting emgine that allow for trustless off-chain transacting in other layered solutions, tailored for specific use cases.

The problem right now is the paucity of imagination and talent, made worse by distractions like appeals to get-rich-quick solutions, short-termism, etc.