Thanks for all the replies. It's funny, that most of the answers try to suggest some alternatives, to get GAS back with another subject...
Cars: No, sorry. Really no interest whatsoever, I even don't have a drivers license, although strangely I work in the automotive industry. But looking at, or even collect cars... Not for me, I'm afraid.
Wet collodion and large format: Well, you really had me for a minute... I really like those images. But no, not my style of shooting. And it would really be difficult, to explain to my wife, why we need to change our little sons room into a darkroom...
Another Leica, digital or film, ... boring.
But prints, yeah, they have something. Also I collect nice photo books an did a few myself. I also have some prints up to one square meter in size, but not so much space to hang them. Instead I have a pretty big display and enjoy my slideshows...
Fact is, I enjoy not having any GAS attacks currently and recently sold some stuff and still try to get rid of some other. It's just... surprising, when I realized, that I'm happy, with what I have and don't lust for anything else.
Enjoy shooting.
PS: Okay, bags... But there is nothing out there, that fits my needs. So I'm trying to create one myself for some time now.