WOO-HOO!!! I've been calling for this since the end of 2014.
"He made back-to-back Wimbledon finals"..."he made the US Open final". Big wow! Federer didn't hire Edberg to help him make it to slam finals, but to help him win slam titles, and it simply wasn't happening. All that happened were blown opportunities: the 5th set at 2014 Wimbledon (please, spare me the "Nole simply upped his game" response. Been there, argued that. No one's opinion is going to change): the 2014 US Open semis; the failure to convert break point after break point in the 2015 US Open final. Then there's the 4th set loss to Gulbis at 2014 Roland Garros (the first time in 10 years Federer didn't make it to at least the FO QFs) and the 3rd set loss to Seppi at the 2015 Australian Open (where Federer had made it to at least the semis in 11 consecutive years). And don't even get me started on 2015 Wimbledon, where Roger played like gangbusters in the semis, but like a pussycat in the final.
I think to have any possibility of winning another slam, Federer needed a change, and I'm now much more optimistic about 2016! This is great news!!