I don't understand the Firefox trend. It was good years ago. It's time to move on. Having one rendering engine is much better than having a lot of disparate features splitted across various engines.
Currently I'm not sure that Google is the very best steward of "The One and Only" rendering engine. Being a commercial enterprise, Google may also have commercial interest that doesn't not always work in favour of the user. The Chrome rendering engine is NEVER going to have anti-tracking features for instance.
Edit: Let's not forget the security implications. A bug in Chrome/Blink will allow attackers to target 90% of the web, that's dangerous.
Why throw that away? I heavily disagree that one rendering engine would be preferable.
I really like to use Chrome but it is opinionated. Bad image quality for scaled images for example. Do not like.
I am no web developer, I think someone could give you more details.
If you look at the longer term, though, that's not true anymore.
I wrote a few things on the topic here: https://news.ycombinator.com/item?id=18664053
That's without even counting that Google get to decide on what can be experimented upon and what can't. You probably don't want a single company to decide this.
EDIT: I found the Downvoters, but can I get a comment so we can discuss? :)
Each Chromium fork is bound to implement its own features to some extent or another. Granted, there is still some monocultrure elements at its core, but this is far from the sheer stagnation that came along with the overreliance on IE6.
Open source isn't a magic solution to Google's kind of monopoly. It's a herculean task to match Google with its free + convenience + monopoly + open source + strong brand recognition offering.
Chrome is already past IE's level of dominance without our realising it - market share percentages just obscures reality.
Google's next card is obvious from their android play book.
They'll soon rip off vital parts of chromium - make em proprietary or google cloud dependent.