I am one of a few that could care less. The auto industry has always lagged technology by 3 to 4 years, as it takes that long to plan changes into cars. The novel idea that someone is automatically informed when air bags deploy is really good, I like that. What I don't like is that same entity can also follow us around wherever we drive and keep that recording forever.

I currently drive a Sienna, and for a small monthly "fee", I could have my car become a WIFI hotspot. Isn't that cute! For a guy with a flip phone that drives with the radio off. I do not wish to be connected 24/7, nor do I want to be followed by corporations unknown to me.

As far as I know, none of the current car makers are installing 5G. 2, 3, and 4G are not going to go away. A large area of the USA is NOT served with 5G. Heck, there are many rural areas that don't even have 2G!

As for backward compatibility, just look at the PC software you are using. I had to buy a new computer because my XP became too old, along with Internet Explorer and any other software that required 64 bit technology.
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Keeping it running is better than buying new