Firstly I don't think journalists are generally sacked over putting their opinions into their work - it is just those issues are contentious so the media company plays it safe (this is wrong - but possibly another, wider, issue).
And he has a strong point about knowing bias's to help put media into context.
But putting opinion into stories? It has it's place (editorial, columns) and we should see more of that! It also has it's place in the general commentary about a writer - so we can see their bias.
But directly in news? I think that is a bad idea - I like my news to at least try to be non-biased. If I know the leanings of the reporter I am happy I can pick out bias that has crept in and dig into those issues more. That becomes difficult if opinion is liberally sprinkled into reportage.
My ideal News website would have the following; unbiased, factual news reports with attached commentary/editorial from writers with complementary bias. That would be cool.