Google Chrome (along with Mozilla, and eventually the other root stores) distrusted Symantec, despite being the largest CA at the time and frequently called "too big to fail".

Given how ubiquitous LE is, I think people will switch browsers first. non-chrome browsers based on chrome are plenty as well, they can choose to trust LE despite Chrome's choices. Plus, they had a good reason with Symantec, a good reason to distrust them that is. This is just them flexing, there is no real reason to distrust LE, non-web-pki does not reduce security.