Mira Mesa is still far if you work in downtown or surrounding areas. There’s still only 24 hours a day today as it was 40 years ago. Those who wouldn’t mind commuting 45+ min. one way to work did so 40 years ago as they do today. What I’m trying to say is, time doesn’t appreciate over time. You don’t get more time with inflation. There’s a limit in how many minutes someone is willing to commute to work. Unless you’re predicting there will be a Carmel Valley/Sorrento Valley like business area up in that area in 20 years, it would still be too far for someone to work in SV/CV and live up there. That distance is similar to someone living in Chula Vista and work in Carmel/Sorrento Valley.
BTW, I have no doubt that technology have greatly improve the building process. I’m trying to say that zoning is more important than tech when it comes to building more homes in areas closer to the center of the city. There are plenty of land east of SD. Just look at how far LA expanded to the east and you’ll see that SD still have plenty of room to grow. Many people who live in LA/OC will consider MM/Scripps/Poway/PQ/RB/etc. as close to the beach. While us San Diegans will say those are inland areas. Far/near is all relative. Is this what you mean when you say what’s far today won’t be consider far 20 years from now? I.E. SD will become the next LA in term of sprawl? I sincerely hope SD won’t become LA.