It might be related to the death of Klaus Burkert who has been working for VillageTronic on the Picasso boards and was hired by met@box later on AFAIK. He died in 2001 after a heart attack.

http://www.amiga-news.de/de/news/AN-2001-04-00077-DE.html

I have my doubts that this was the only reason that amijoe never went on sale, though. Personally, I have seen a hardware prototype of it - so it did materialize in some form - but I have never seen it working ....