I think there is a solid chance it won't happen.
Federer will retire and will not do a Hewitt, and I think he will be good enough to beat Andy until the day he retires.
Their match-up used to be close or even in Andy's favour, but since Federer has started his new tactics, Murray has won a total of 1 set against him (and that was a tiebreak that he shouldn't have won anyway).
I think the current match-up between the two is terrible for Andy, look at their last match for instance.
Assuming Fed doesn't go off a cliff, yet still manages to meet Andy in the draw, I don't think it's going to happen again.
I agree with your overall line of thought but I think predicting Murray losing every match against Federer from here is not far from exaggeration.
Murray is 6 years younger than Federer. It is huge advantage as we all know. From here Federer having off days like Seppi will be more frequent scenario than past. Can you imagine, how badly Murray would've beaten Federer in AO, if he had made it to QF?
So Murray will most likely beat Federer again but safe bet from my side will be predicting Fed's win in their majority of future encounters, let's say 6/8 wins. (75% winning ratio)
Federer has already solved his matchup problem with Murray winning 10 out of last 15 matches since Cincinnati 2009.
Now I come to his decision of switching bigger racket and adding Edbergian approach to his game. If someone asks me how racket change and hiring Edberg has helped him, then I'll say he's more closer to his 2004-07 aggressive, efficient All Court Game than he was during timeframe 2010-13. Numbers don't lie. He has most consistent season since 2007 last year in terms of overall win % (85%+), number of Finals (11) and record against Top 10 players. (17-5)
His overall record against Top 10's in last 15 months is quite spectacular (21-6) for his age. This shows not only for Murray but every top player, he's much tougher to beat right now.
I pointed this out earlier and posted in other thread that currently he seems to be in position implementing his game more efficiently. Though his peak level of play ain't high like used to be but his average level of play seems to be good enough to take care of limited players like Berdych, Murray consistently. Both will struggle to win sets against Fedberg, let alone matches till he significantly declines or gets injured. I strongly believe Federer has two more years left in him in which he will continue to remain relevant factor at top, like he's now. So more wins to come and more bumps.
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