I predict suburbs will vote no more Democratic than they did in 2016, because I don't see the Democratic candidate being as good a candidate for the suburbs as Hillary was.
Not being Donald Trump should be good enough to them.
I'm not so sure, since Dems could very well nominate a far-left candidate, who would not play well in more suburbs since they're upper-middle class at least.
Any Democratic win in 2020 will have to come by either increasing margins/turnout in big cities, reducing margins/turnout in rural areas, or demographic changes, or all three, of course.
