Until now, Boeing's business plan is that they will be building a starship for NASA in 2060, but you will still be stuck with a 737 on Southwest Airlines, a A320 on Jetblue, and never know that aviation could be better.
The 737 throws off a lot of cash, but the single-aisle monoculture makes flying miserable.
A 737 replacement will be expensive, take time to develop, and involve risk, but the end product could be the resurrection of the Boeing brand. Since there are so many 737-class airplanes flying, anyone who wants to see a better flying experience or is concerned about environmental impacts of aviation such as airport noise or carbon emissions would realize that a 737 replacement could have a greater impact than the widebody planes where competitive developments are happening.
You shouldn't have to fly international to benefit from 50 years of aviation improvements.