Behringer is doing to the music market what Michael Dell did to the PC market in the 80s, it's a predictable business play. He's innovating on the business side (manufacturing and marketing) to sell other people's ideas. The fact that Moog as a company still focuses on quality and paying American works a fair wage gives people who can afford it a choice. Behringer is giving choices to all the people who *can't* afford a Moog. The difference between a modern Minimoog and B-Model D, other than the physical size and quality, come down mostly to price and concerns about social justice. If you can afford and are willing to pay for social justice (fair wages, profiting from your own ideas instead of others', etc), and you have room for a Minimoog, cool. If you can't afford to pay for those things, even if you would like to, or you prefer the smaller form factor of a B-Model D, then there you go.
Many of these same sentiments apply to Oberheim and Dave, with the differences that they're both still alive (thank my PEK! (which is God)), and due to my own ignorance, I can't say for certain if they do their manufacturing in the US and make a point to pay liveable wages across their supply chain.
But in the end, Behringer's play is to the low end hobbyist market, so I don't think they'll ever be a real threat to companies that prioritize quality. The Model D does sound great, and I plan on buying one and would keep it even if I can someday afford a Minimoog, but I'll never revere it in the same way I revere my PEK or OB6.