This is a case though where your other sound systems you guys are also trying to plug into are outdated. Because your phone is not among your outdated productsl, doesn't mean it's a manufacturers' fault. They are simply catering to the market.
Newer head units (stand alone audio sources) have Bluetooth and other connectivity features plus a jack anyways.
So because you're using outdated shit it's the phones fault? Let me ask you, so you think more devices in the future will have jacks or less? Answer: less. The sooner you change your equipment the less heartache you'll have.