My take on this whole "Acoustic - GK" thing is fairly straightforward (at least from a business angle). I know that he left on tour with several Acoustic 360/361 rigs. Played them on a number of shows then suddenly went BACK to GK - apparently while on tour, but I don't know this to be a fact.
If a fledging company like Acoustic USA is fortunate enough to grab a major endorsee (like Flea), they do what they have to do to make the guy happy. An endorsement like that is absolute gold in this day and age of marketing and competition. What does that mean?
Usually a new company would send a rep on tour with the band to insure that any problem with the equipment (yes, it happens) is taken care of IMMEDIATELY. Not saying that this DIDN'T happen in this case (I don't know) but I have a feeling that there was a problem or two and there was no one to communicate with to get the problem taken care of quickly.
This is just supposition on my part. I don't have any information of any kind one way or another but it seems to me as though someone may have dropped the proverbial ball on this one.
Bottom line - for any "start up" operation, this could potentially be the kiss of death. Mistakes like this (for whatever reason) are usually not recoverable. Granted, Acoustic USA is a "boutique" operation that only builds a few for a few - but still....word of mouth has killed many a business.
What is fairly apparent is that Flea is still featured on their web site. I assume that he's still under a contract that allows his image to be used. That leaves Larry Junstrom (.38 Special) as their only other major artist endorsee and to date, I haven't heard if he is still on board or not.