We above all else must respect those that still contribute to our Spanish wiki.
There doesn't seem to be many (any?) permanent contributors though. The material on es.wikipedia.com could easily be merged with that on enciclopedia.us.es, thus avoiding any disrespect to the authors.
Besides as someone already said, we can port the EL stuff to our wiki since they use the same license
...with proper attribution of course.
Frankly, I find this game of "our encyclopedia should be bigger than theirs" and not providing any links from es.wikipedia to EL or from EL to es.wikipedia quite ridiculous and counter productive. Since both projects have precisely identical goals, it just amounts to a duplication of efforts.
Axel