Europe is so much richer and more complex than the US. You listed four major languages in one country. Wow! BTW - Isn't Beat from Community Builder also from Switzerland? I wonder if the two of you live close by?
Just thinking out loud, but, when I think of Users Groups that are active over many years, the people who attend the meetings tend to live or work within a couple of hours distance of the community where the meetings are held.
The User's Groups can be all different sizes. We don't all have to be as big as Berlin's JUG to be successful.
I live close to Omaha, Nebraska, and I can think of six of us within a two-hour drive (plus, both of my teenage kids are Joomla! users). And, I'm guessing when we started organizing our JUG and began asking around, we will find there are at least double or even triple the number of people who have already been using Joomla!. That small group can meet once a month and focus on how to share Joomla! within our community more broadly and find existing users.
Steve from Alledia started a thread on Atlanta, Georgia and got one response. Now, I am *quite* certain Atlanta, Georgia has many, many Joomla! developers and website administrators in that community. We just have to connect with them.
In fact, if you watched as Brad and Wizzie and Russ announced the Melbourne Joomla!Day, it started out pretty slow. It was funny, though, how activity picked up as the date neared. Even after the "deadline date" people were posting that they hoped they could still attend. And, the turnout was fabulous!
It will be interesting to see how JUGs begin in Switzerland with all of the languages and regions and the distance. I think we should be encouraged to try a local JUG in our own cities even if we do not expect a huge turn-out. It will grow and it does not have to be huge to get started.
Yes, please keep thinking! Also, read through Brian's links. Thanks for joining in and please invite others, as well.