It hardly impacts the customers these big corporations focus on (mostly other big corporations).
I won't go into all the arguments pro and con this change but, suffice it to say, companies that have HPUX/AIX/Solaris/etc servers and cannot afford a support contract anymore are probably better served by other offerings (Linux, BSD, etc) running on less expensive hardware.
People will probably say "HP server division will die now because of this". While it's likely HP/Oracle/IBM's server divisions are not cash cows anymore, this is unlikely to happen. Just as with mainframe, it's part of IT optimization and using the right tool for the right job. Mainframes aren't gone, just hidden away in very specific areas. These proprietary Unix behemoths will go the same away... and the hidden areas they will be used at can afford the support contracts.
Overall, nothing new happening here. We are just going to repeat all the arguments again for why it's such a good/bad idea.