I think this device hit the right market.
For what wireless is most useful for me is for fitness. I want to be able to use wired earphone of my choice and want the module in smallest formfactor possible(for fitness application), flexible options in codecs (for high beandwidth aptX HD or LDAC), quick charge (for times when battery is drained forgot to charge and need it's usage right away), and low latency for video, would hit all the tick marks to be more preferred than wireless earphones if you have a fav wired earphone you want wireless.
If we can get shorter cables for different earphones with detachable connectors would hit another sweetspot.
Fiio has 60cm mmcx cable, intended for BTR1 at first..