I've been looking forward to this. I've been using bluetooth headphones for years lol, I HATE wires on headphones, and it's mostly to do with getting in the way.
I may be swayed back to wired headphones if it means better sound quality, which according to research, lightning headphones equals far superior sound.
I think there will be room for both depending on your situation.
The most frustrating thing about this debate is that those who complain about the quality of BT headphones, are doing so based on current technology, which they further assume will remain unchanged when Apple drops the 3.5mm jack.
But nothing could likely be further from the truth. The announcement of BT 5 confirmed that suspicion for me. As Apple sits on the BT SIG, they helped develop and approve the new standards, which would give them an edge over the competition when they release the next iPhone without a headphone jack. And, owning a headphone company allows them to release one of the few compatible products. So depending on what BT 5 brings, you may not hear any difference between the new BT headphones and what's available over the Lightning jack, thought I would expect it to be equal to or better than the output from the 3.5mm jack.
And it doesn't stop there. Apple might introduce something totally unexpected, like a new low power AirPlay technology with BT 4/5 compatibility. Since the wireless headphones are going to have the same benefits as the digital/Lightning compatible headphones -- custom matched DACs/DSPs & Amps -- then the only variable will be quality of the data stream, and wireless reception.
Compared to 3.5mm output, for anyone who prizes sound quality over convenience then Lightning is capable of offering a superior option. 3.5mm output is limited to the quality of the internal DAC/DSP & amp chipset supplying the audio signal. It's also limited by the device's supported formats. The quality of a digital output, by whatever means (Lightning, USB-C, BT, etc.) is therefore determined by whatever equipment the user plugs into it, rather than the device itself, as is currently the case. And that's a huge advantage over what the old analogue signal-over-3.5mm offers.