I think you're playing with fire on that thought. There is a reason why someone dominating a space and reaching a monopoly position is feared. It's not going to end well tbh, someone needs to step in, and fast.
The PC space is still alive though, Sony and Microsoft are both trying to grow into something there, so you get both platforms in one spot. If Sony build a launcher things could get interesting. And if Microsoft succeed to update their Xbox App into something people want to use. Steam is too big at the moment. Epic, Microsoft, Ubisoft, EA, GOG are keeping Valve somewhat in check but I'd say it's because Valve themselves aren't douches that things hasn't already turned sour there. They definitely have too much control.