Yes, they are becoming more difficult to find, but there are types of non bluetooth wireless headphones as Graham mentions, which do not have the bluetooth latency problem. The universal connectivity of Bluetooth has many advantages and the downside of latency is not a problem for most applications, but it is unsuitable for live keyboard playing.
Latency is not a problem limited to electronics though, those of us that have played old style large pipe organs in cavernous churches might also have noticed similar effects. The sound sometimes seems to come back at you long after the note has been played
Mike