"Now concentrate on small planes 100-150 with 5000nm range. B737 MAX 7 is a good start"
Who wants to sit in a 737 for 11 hours? Same goes for the 757 ... what happened to that?
If they're too uncomfortable then you'd have to reinvent the 767-200. And poor economics meant that went the same way.
No, the only efficient alternatives to the VLAs are stretched LARGE twins. The idea of long thin routes with small aircraft has been around for dozens of years and has never really taken off. Operating costs per pax are just too high.