The idea of links for NA servers work great, because everyone speaks either English or Spanish as a majority language.
When links are made across EU servers, for example, we have German speaking worlds linked with French speaking ones, both servers have a hard time cooperating with each other. Both servers are left weaker. The Francophone players do not understand German, and will not follow the German server commanders. The same also happens the other way around, the German players take little interest in a commander that speaks only French.
We all know this is not the optimal solution. I would think though, that linking only German speaking worlds with each other, French, and Spanish servers linked the same way, would at least foster greater cooperation between servers. At least then we can communicate with each other.
I'm looking forward to the World Restructuring Beta 4 very much, and it will be a new experience for me anyway to participate in WvW in English... XD