People saying MS would have entered the business without Sony paving the way have no idea what they are talking about. An industry is only appealing if it is very widespread or starting to boom, and the gaming industry was none of these in the time Sony came along. Only the Game Boy sold in large numbers, the SNES didn't even sell 50 million or the Genesis and the Sega Saturn just ridiculous.
What people fail to see is that we have to thank MS also for driving forward the industry also, because with the 360 it became a great competitor, it made Sony scared and made the PS3 better and the whole previous gen much better. It is the natural way of things, because when things are done well then things improve all around. Like the PS4 now selling so much, it is because Sony did things right. 250 million consoles between PS1 and PS2 are nothing that can be so easily replicated by another hypothetical competitor.
What is the sense of people expecting that someone will always come along to make everything better? Nintendo saved the industry, Sony drove the industry a lot forward, MS helped a lot, Smartphones made gaming truly truly mainstream. Those people did that, there would be no guarantee that someone else would come along. It is like saying if there would be no Einstein, we would still have the same breakthroughs just because magically someone would come along and do the same. No one would come along, or maybe they would, there is no certainty. So let's all thank all the companies that did something for the industry well so that we can have amazing experiences like Bloodborne now.