Yes people will stop using Bitcoin b/c they have to pay $0.5 per transaction. They rather use bank and will pay $20.
Or use an altcoin that doesn't fetishize 1MB blocks and pay $0.01. Bitcoin can't afford to be ultra-conservative in the face of endless altcoin competition. It must take calculated risks or be overtaken.
or ... there are SC
Yes, if they work (as an aside, why does Blockstream keep saying sidechains are not a scalability solution?).
I'd rather it be spinoffs, which are much simpler and less risky.