Earlier quoted context omitted.
...which would be detrimental to Microsoft. Limiting our options to theirs is precisely their goal by giving us a great IDE that only works on Windows. They're never gonna go it. They stand to win nothing from that.
Yeah, just like Office for Mac, they'd never do that. /sarcasm
Making VS on Mac would earn them no money directly and would only encourage the creation of more Mac apps. At best, it might increase the takeup of .NET/Mono on Mac, which might mean more .NET apps, but no money since .NET runtime is free. I'm not seeing the incentive.