Are you referencing something like this? https://cplay2air.comYou'll be able to buy an adaptor to allow wireless CarPlay or you'll just stop using CarPlay and stream music over Bluetooth like all those that don't use CarPlay.
I'm definitely not going to stop using CarPlay and I will going forward only purchase cars that have Wireless CarPlay but I'm just saying Apple's not going to dictate when I buy my next car and if Wireless CarPlay solutions suck, I"ll just keep My current iPhone longer than an annual upgrade which is how I do things now.
I was going to make a reference to losing the headphone jack but at least Apple gave us a lightning to headphone adapter. My in-ear monitors now have a bluetooth option so I have that setup but this would be like apple killing the headphone jack and offering no way to plug in my $600 headphones into the phone. I'd just keep my old phone until my headphone company made a bluetooth adapter. This is similar.