A VB4 style wouldn't be compatible with this site which uses VB 3.x. Also any responsive style on vBulletin-Germany would be news to me, not that I have ever checked.

Which part of this was unclear ?

We'd all be happy if just the default vb style was responsive..lol

I said that the mod addon wouldn't have to be rewritten if you were to move to vb4

We're not moving to vB4, so it doesnt really matter.

Even a good mobile theme would be great for this site... or possibly an app. :)

I'm not seeing a responsive style anyway.... http://forum.vbulletin-germany.com/forum.php

Unless I'm missing something.

I know things are slow around here but this thread is beating a dead horse.

What would be great for this site is more developers.

More developers to do what and (most important) for whom? Forum market (talking for all forum scripts) has shrinked so much last years. Much more for vBulletin. Give a look to Mods section and check how many downloads most of new mods have. Not even 20 even if most of them are really good mods. Do you know what was "20 downloads" 5 years ago? A per day average download. And now is a total for 3-4 months.

From the other side don't forget that there are mods almost for every need. Coding a 2nd (or worst, a 3nd) mod for the same use is a waste of time for any developer.

True Nick, things have really gone downhill in many ways for forums in general and releasing free mods here just does not stir up the kind of activity and interest that it used too. I do miss those days..