We went a full circle and whole world nearly runs on a single browser engine. And beyond that if we consider the portability of modern software.
Yet, this Blink-Chromium monoculture is not a matter of concern to competition regulators. Whether because "it is what it is" or perhaps because of some deep shenanigans we don't see, it's terrifying because we lost choice and we're dependable on Google whims. All the hope lies in these small projects that bloomed around, and perhaps even in Firefox - if Mozilla will be ready to take own examination of conscience. But even so, wind of change might be not that strong.