Yep, age 70 is the mandatory retirement age for Packers' Presidents/CEOs. I've been putting that out there for a few years now whenever people talk about wanting Murphy fired or just wanting him gone in general that the wait wouldn't be long either way.
I do think he's been a good caretaker of the team overall. Like you I'm not a big fan of giving himself "more power" on the football side of things but let's be honest, he already had the power anyway. He just made it a bit more official. I think there are pros to go along with the cons to that. He continues to leave football decisions to the football people and if he just wants to be looped in and be more of an informed overseer on that end ultimately it's fine. I do think that head coaching hiring & firing decisions should be handled by the GM though. Honestly, until we see a head coach fired or replaced we're not going to know if this is a real hinderance of the power structure or not.
Only time I had a true issue with Murphy was when he continued to back Ted Thompson even when it had become obvious Ted had fallen off in the quality of his team building decisions. Ted's ongoing avoidance of the media was also a big issue for me, to me the guy had been given too much free reign with no public accountability. Once that problem got fixed I felt Murphy did fine. Was he my favorite guy? No, but the Packers are a thriving franchise and their financial future feels really solid. Overall job well done.