Apple isn't going to remove the DAC from the iPhone. They will likely put a less expensive low cost version in there since the built-in speakers don't required the same quality as the headphone jack does.
So every pair of speakers capable of BT are Lo-Fi? THere's not one quality BT speaker out there with an analogue interface? Give me a break. And then there's Sonos. Not BT, but wireless, built-in amp, DAC and power supply. And hardly "Lo-Fi".
You do understand that Apple pays less than $18 for all of the user I/O chips, not just the DAC and amp. You're making a ignorant mountain out of a molehilll you don't even understand.
You're ignoring his point, even if he is using a hammer for surgery.
The DAC probably won't even change, making it all the more disappointing.
Most BT speakers that aren't headphones are mono, improving single channel quality. And if I'm not mistaken, BT Stereo is sent using 128, with "fill in" stereo encoding (edit: joint-side stereo... had to google since it hasn't been relevant for a decade.) - essentially reconstructing the channel separation on the fly. It's not true two-channel because then you'd be stuck with two discreet 64kbps for data, and even HE-AAC at 64 is noticeable. So "Lo-Fi" has a point; the signal underutilises the hardware, often by a lot. Of course you know this because using a patch cable vastly improves quality, and that's the point, no?
How much they pay... like I said, they'll probably maintain the same DAC for a lot of reasons.