This: Why Linux is not (yet) Ready for the Desktop (a.k.a. Linux problems), 2012 edition
There's one problem no amount of money can solve: for most Open Source developers Linux is a playground, a thing they don't care beyond their aspirations, thus we have constantly broken features and API breakage every odd moon cycle. With such an attitude there's no way Linux will ever attract a big number of serious ISVs. Of course, people will be quick to point that already available Open Source software is enough for everyone - but that's a serious myopia. No, it's not enough, very very far from that.