Intel x86 considered harmful – survey of attacks against x86 over last 10 years

Yes yes, everyone should move to MCST Elbrus :D

No, use Gaisler's stuff:

http://www.gaisler.com/index.php/products/ipcores/soclibrary

Also SPARC but with plenty GPL. Has a quad-core, too, with all of them designed to be easily modified and re-synthesized. :)

There are a few of these (open architectures) - but does anyone know how much (ballpark) it'd cost to make something like the Raspberry Pi 2 (ie: a full SoC, with gig ethernet, usb, hdmi, sata) support? Say 10.000 units?

I'm assuming it'd be expensive, as it doesn't appear anyone's doing it...

Several million dollars. Everything is extremely expensive - IP licenses, ASIC layout software licenses, simulation and verification software and possibly hardware, mask costs, line setup costs, wafer production costs, packaging costs, testing costs, etc.