Here is my take on the situation.
First, a lot of companies own the rights to build off the Maico's technology since they went defunt. This is a fact. The main "Maico" line saw many improvements up through the ownership of Brower with the last being the Hydraulic clutch. Koestler bought the pieces and made Maicos ever since and made small changes (like the coolant drain), but not big changes. I've bought many parts off Koestler, seems like a good guy and has a lot of inventory.
The second line, which has argueable seen the most improvement ignoring M.I., is Zabel. Zabel engines will also bolt directly into the Maico frames (which the bolt pattern is the same since 1985) so you can upgrade any bike buying a refurbished Zabel engine from Zabel for a decent price actually, which would have a lot of improvements.
So, no one is trying to defunt Koestler and no one is preventing anyone from using the Maico technology even with this post, since the license to the technology is not the same as the license to the name.
Now, enter Maico International, originally a distributor for Koestler. As you can see, M.I. has tried to bring the bikes more modern, which is obvious and make improvements. Koestler is not doing this. They are promoting Maico and trying to bring it back into the spot light, which Koestler is also not doing. Maico International is attempting to bring Maicos back more mainstream. They have done a lot of work to promote the brand and get the name out there so a lot of people who previously thought the brand was gone now see that it is back and making a comeback. Koestler does not seem to have any interest in doing this on a grand scale (At least, I have not gotten this imprssion), they are a small bike shop and they make the bikes and sell them, but they are far from wanting to promote them, make large scale engineering or invest heavily into this. There's nothing wrong with that, that's what he wants to do and he was able to keep the Maicos in development to this day so they are still available after Brower went under. That's great.
However, Maico International is looking to go further than that now, which is they are spending a lot of time and money in R&D. Note they too are a small company with only a few people who actually work for them, so even the tiniest set back can be major. In the last year they went from a distributor of Koestler with modifications to developing completely their own machines. It's not unreasonable to see setbacks and its unfortunate. Hopefully, once all these set backs are worked out, the new Maicos will hit the streets and really be available. Production costs will obviously be high on a small scale, but if they make a strong comeback, who knows, if in several years Maico is more popular again and the prices will come down. I know that's a stretch goal and we have through the first bikes first, but thats really all they are trying to do.
Koestler's bikes will still be Maico, they are reproductions of the Brower's bikes essentially. Maico International is just comming in and taking those bikes to the next phase of development. They are both still Maicos and should continue to be Maicos. So before we jump to conclusions, I think we should give them time to work everything out and see where it goes.