The ouya is "dead" in my opinion as well. But dead in the same way the pandora is dead. There are people that still cling to it, and worship it like the sun, but it's out of the tech news spotlight for sure and not on many people's "must buy list"
They both have a community of active users and developers that love it. (and lots that hate them both) But it's by no means making headlines except for stories like buyouts, or referring to the manufacturer's history with a new project or model etc. Tegra 3 is old news and so is omap 3.
The ouya is still being sold at brick and mortar retail stores as far as I know and it's parts aren't EOL yet, and the pandora has a little more going for it on the software side, but they hold more similarities than they do not.
vita vs ouya...
I don't think ouya and vita is a fair comparison, as there are replacements in the wild right now for the OUYA that do things better. I actually kinda hate when people compare closed console systems to general computing systems. The only "replacement" for a console is the next generation useally from the same manufacturer, where with a general computing system you can find a replacement from another manufacturer usually within the same year as the first releases that's capable of running the same software, just better, cheaper, or both... effectively killing the first.
It's like saying my laptop, or desktop... or hell just my GPU is "dead"