Not Dead yet!
The problem is that the majority of tech companies involved with DARPA, or any government "stimulus" (like all the so-called "green" tech and electric car companies of Algorean ilk) are *not* about making or researching a product or technology-their company exists for the sole purpose of *obtaining Government money*. No other reason. So when there's not enough windfall being stolen from taxpayers' pockets, the company decides it's not profitable to keep up the sham. It then "goes away" and the principals involved recreate another "company" to cash in on the next ill-advised porkbarrel project ("green energy", "security", recycling, whatever).
However, if a technology actually has real promise, someone somewhere will create a company to sell it: