Compromising on the ruleset is such a stupid idea and is completely the wrong way to approach the situation. I'm not even saying that one region should adapt to another region's ruleset. It's much better to have a ruleset that most of the community can agree on than a compromise that makes nobody happy.
The rational way to approach the problem is to:
1. Make a list of many possible rulesets
2. Set up a list of priorities (e.g. works in online matches as well as cups, doesn't require plug-ins, etc.)
3. Choose the best ruleset based on how well they satisfy the priorities
This is a time consuming solution, but it's so much better than tunnel visioning on either the ETF2L or the ESEA ruleset, because there are so many more unexplored options out there. It's time for the leagues to take initiative and make this happen, in a transparent manner so that everyone in the community can be a part of the decision. In the end, a unified ruleset would benefit all of the leagues, so it's a common interest for all of the community.