Microsoft needs to become more outwardly focused and influential softies leaving the fold and pushing from the outside will do that. Right now the two good things Microsoft has going for it is MVC and C#. Both of which were inspired or heavily influenced by outside forces (MVC by Castle and C# 4 was influenced heavily by Python).
Phil Haack moving to Github will hopefully push Microsoft to embrace open collaboration systems a little better and because he's outside of Microsoft he won't have to deal with "you might kill off VS Team Foundation" hindrances.
All this in turn MIGHT give Microsoft a chance at becoming relevant again in the developer space (and please don't say "a lot of people use Microsoft" because I'm one of those people and I know a lot of those people and they're all looking at their future with worried eyes)