When Sun was struggling to stay relevent in servers it mades Sparc open and it went nowhere. I see no reason why IBM would not face a similar fate with Power8. I see vultures circling this architecture.
I have a few words to say about IBM's proprietary technology: IBM PC Technical Reference Manual.
Regarding PowerPC, I've used a lot of IBM PowerPC 4xx series embedded processors over the years, and when IBM owned the technology the documentation was excellent and almost completely open. A while back they sold the technology to AMCC (now Applied Micro), and now you have to be a registered customer even to look at the list of products. I wonder how many sales Applied Micro misses out on because prospects can't even see what's offered?
I'm delighted to see IBM still pursuing PowerPC technology. IMO it's a great architecture, much cleaner instruction set than ARM. Go Big Blue!