If no-one is willing to have a public confrontation or pursue legal action, might I suggest at least a publicity drive? A concerted effort to post succinct statements of the situation (e.g. 'John Westlake has taken £x in crowdfunding for xyz, and produced nothing in almost ten years; see this thread on pfm for details') on as many audio related websites as possible, and also perhaps sent by letter to audio companies globally? Also contact audio magazines?
Although I can't agree with Rune's optimism regarding the imminent (or even eventual) delivery of a product, I agree that negative comments are unconstructive, if they don't lead to action. What do any of you have to lose at this point?