I use Chrom(ium), Firefox, IE, and Opera, and even Lynx, so I have no particular loyalty to any one browser, but it doesn't feel like there is all that much of a choice anymore among the "mainstream" ones as they all seem to be converging in design. Even Opera, which used to use its own rendering engine, has moved to WebKit, and Blink is not all that different from WebKit either. I certainly hope Mozilla will never choose to turn Firefox into yet another WebKit shell, and neither Microsoft with IE.
Web developers trying to make their pages look exactly the same in "all browsers" may enjoy a browser monopoly since it reduces the effort, but I think that's the wrong way to do it; instead, they should aim for "similar enough" - after all, content is what site visitors are after. The idea of progressive enhancement/graceful degradation, which can make for a better environment for browser diversity, seems to be completely lost on many developers.