Arguably we already form a very rudimentary one when we converse with someone. We don't actually experience their consciousness, but we listen to the words they say and try to form a simulation of what they are experiencing (empathy) the thing is, it will always be warped and through the lense of our own previous experiences, and we have the option to turn it off (stop conversing).

A hive mind would simply be an extension of this, although I'm not sure if one would lose themselves in the hive. I think we would need a few decades to experiment with this, I know there's plenty of people whose consciousness I would certainly not want to share.