I'm not sure this is quite as true as we think it is. Long before the internet we had physical newsletters and pamphlets and fliers with their own slants, and we had newspapers with agendas of their own and no particular standard of ethics, &c, &c. I'm not sure "headline makes me click it when I see it on Google" is a worse pressure than "headline makes me buy a paper when child selling papers on the corner shouts it".
That said, there's unquestionably room for improvement.
I do expect that bubbles have got less regional.
I wonder, at a deeper level, if the political divide in the US is fueled by the "bubble" that google allows: many years ago, people read newspapers covering all points of view, but google news lets you select which sources you draw news from (allowing you to select only fox news and drudge report, for example)