Just a theory, but maybe people who are great designers and engineers aren't necessarily great marketers.
After new companies and product lines are launched, it probably takes quite a bit of effort to keep the momentum going. Now I'm not a great fan of marketing, because I think good products ought to sell themselves. However, it's only a matter of time before others will jump on the bandwagon, and try to take a slice of the pie. That means in a competitive environment you need a lot of investment in marketing, and maybe some component manufacturers didn't fully appreciate that.
Perhaps that's why smaller innovators, designers and manufacturers so often get gobbled up by larger ones. The owners realised that they needed huge investment to maintain their current market position and share. It's easier to just sell up, and move on, rather than die a slow death as a much larger competitor moves into your area of business and crushes you with their marketing experience and marketing budgets.