1: "governments we didn't vote for"
If this indeed is a reason for splitting a political entity then stand by for further splits

An important point. There are two unquestionable notions of "we": a) my family, b) mankind. Anything else is an alliance for a purpose, and thus subject to abuse by rhetorically talented leaders.

Democracy can never be perfect, but can always become better. Units of democracy between family and mankind need a clear definition and well-tailored responsibilities. It turns our that the roles of ethnicity and historical units are grossly overestimated nowadays. (At other times and places, religion and dynasties were and are considered paramount - equally inadequately.) Therefore, we - mankind - must demand a new political system that takes account of that.

It would be unreasonable to hope that those currently in power collectively abandon their privileges by their own will. Ordinary people must demand it, after thorough discussion. The referendum, however the outcome, may bring about a chance to think about new constitutions, not just oil and currencies and other things "we" may have.