In the 50-60s cars(and roads) were terrible and commercial aviation was slow, very expensive, and limited. Both methods were also not terribly reliable. In comparison, flying a small private plane was pretty useful and relatively affordable. By 90s cars and commercial aviation improved a lot and got much more affordable. Small GA practically stayed the same just more expensive. Now there is a little practical use for it as a means for travel. Most trips are better(logistically), faster, safer, more reliable, and far cheaper by either car or commercial aviation(depending on distance).
Y'know, we as pilots sell GA short an awful lot. I can't tell you how many times I've heard that GA is just not practical for travel, blah blah blah.
Personally, I have used GA to great effect for personal and business travel. With a family, it's often/usually cheaper than buying 3-4 airline tickets. My door-to-door times are very competitive with airline flights on sub-1000 mile trips.
I haven't ever been stranded overnight by a maintenance issue. I've arrived a day late due to weather twice (both related to Gaston's!). GA has been highly reliable for me.
Yes, it takes money to get to that point. You really need to have an instrument rating for it to be this reliable, though I did trips from WI-KY and WI-TX while I was still VFR only. You need to fly and/or train enough to stay proficient. You need a plane that is relatively affordable to operate. It helps if you are able and willing to fuel your own airplane.
But all of this "time to spare, go by air" nonsense does us all a disservice. Yes, you'll need to have some schedule flexibility, though not as much as you'd think. You'll need to be willing and able to scrap plan A, B, and C and make up a new one on the fly.
And you know what? I've never been stranded in some airline terminal waiting in line to try to get the last seat on the only flight out of town today because ATC/Weather trapped my plane somewhere, or the crew timed out and they're looking for another one, or any of the myriad nightmares that come with airline travel too.
If you want to travel by GA and you're willing to put in the initial effort and money to get to that point, it can be practical, reliable, and even "cheap" (relative to other modes of transport).