I would suspect, now that IBM has enhanced the range of Power 8 models, 
that IBM sees no need to continue marketing new Power 7 machines.  Or, why 
should people upgrade to new Power 7's when Power 8's are out?  This frees 
up manufacturing to producing only one line of hardware.
As far as the processor activation goes, if it means what I think it does, 
then you should pony up and activate those additional processors before 
then, or plan on leaving them dormant.  Although I don't see why they 
would do that.  Maybe they meant they won't be selling any more physical 
processor upgrades.
We skipped Power 7 and upgraded from Power 6 to Power 8.
Upgrading from Power 6, and upgrading to 7.2 is what killed most of our 
old hardware (actually all except some tape libraries we've recently 
upgraded).  I don't think upgrading to Power 8 from Power 7, keeping the 
same OS level, killed that much hardware.  Granted, I don't think Power 8 
supports 6.1 but if you still need to run on that you have some serious 
issues.
http://www-01.ibm.com/support/docview.wss?uid=ssm1platformibmi
http://www-947.ibm.com/systems/support/i/planning/upgrade/suptschedule.html
Rob Berendt
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