True, so why do you use ham radio?

Use your cell phone.
Exactly my point.
Addressing the original question "is APRS RF in decline", yes it is.
People overwhelmingly do exactly what you suggest above, they
use their cell phone.
If we're going to try and reach out to youngsters today, we'd be fighting
a losing battle if we approached our "sales pitch" with things like
"You can send a text message to someone else who has also spent a
lot of money and become licensed and knows how to operate the kludgy
equipment that's a couple of decades old".
If we're going to make APRS useful, sending txt messages is hardly a
selling point. Personally, I think it's hard to find much of any selling
point. I wish there WERE. But IMO, the answer to the original question
is - Yes. The numbers may be going up, but the use(fulness) is very
much in decline.
Lumpy N0EQ
Did you do a lot of those Emergency Broadcast Warnings?
Yes. Had it been an actual emergency I would have hid.
www.LumpyMusic.com