I imagine bystander apathy will always exists to some extent but in the digital cell phone age there's also a greater chance of someone calling 911 or posting a helpful video clip these days. The so called "None of my business" attitude is probably related to the "No good deed goes unpunished" or "Snitches get stitches" mindset. Most people want to be left alone or out of it. They might consider anonymous aid if there's a "tip line".
Maybe that is a geographic deal. Out and down here everybody gives a darn about everything. A little less than optimum on the PTA area. Maybe we could have a few more pick up random trash. Of course driving right is a bit of a problem. Homeless are approached and given to. Small children are protected. Obvious criminals are reported or approached. Police are supported and monitored. Our environment is better than 5 years ago. We are constantly going after politicians. There are abundance of people acting the good samaritan. We really do report drunk driving. Even meth houses are reported and gang hangouts get shut down. The last two cars I saw stranded there was obviously someone who pulled over.
I understand that it may be that bystander apathy comes into play when there are a lot of people around and everyone thinks that someone else will do something about it. One book suggested that if you are having a heart attack, for instance, you pick out someone, say in a red jacket, and specifically ask them to call medical aid.