Unless Sony is going to start competing in the PC space, it's definitely not a GOOD thing for them.
Microsoft wants higher console sales, but they have the PC as a blue ocean space where everything they put in is returned tenfold, and only for them. Microsoft doesn't need Bethesda to drive sales, this was a big dick move. I think you're seriously underestimating how MS quadrupling down on PC has affected their gaming strategy. Whether you know it or not, Sony is in the PC space now, Microsoft isn't in the console space.