All my favorite titles across the past several years have largely been exclusives, so I'm not exactly keen to jettison them. One unified product is never good for any sort of marketplace as it becomes a monopoly that the corporation can easily leverage for whatever purposes they so desire. Competition (in a mostly fair market mind you, which is a larger topic to debate on and has issues as well) breeds innovation and forces competitors to adapt, so the one platform isn't great. And games being on every platform gets more messy because it requires more and more resources from developers that could just be putting their effort towards the game (and probably directly inspires more crunch if the model of Fortnite is anything to go by in this regard).
Not to mention, there's a lot more inspiration in developing a diverse library of exclusives when you have a console to support, so you as a console manufacturer are probably more willing to take risks to develop an impressive game portfolio for your customers. Without the incentive of selling your own console product, there's less risk taking in the industry as well.
I just don't think the eradication of exclusives is going to go the way people think it is. In some way, exclusives are one of the few areas where companies are incentivized to put more effort and less bullshit into their games to showcase their hardware. So, once again, taking away that incentive might not be for the best.
Also, just saying, but Windows PC as a "platform" has a fuck ton of exclusives or "best versions" of titles out there that aren't available on consoles too, but I'm not going to call for every one of those to be ported. Hell, sometimes different consoles inspire different bases at that, which is also a good thing as we end up with a wider range of products available to customers to choose from.