You misunderstand. I'm quite worried people will dismiss everything they dislike about him as not mattering because it doesn't matter to the conservative next door. Biden winning is inevitable in that case.Biden going down is not an inevitability whatsoever and you are going to be in for a world of shock if you don't open yourself up to acknowledging that Biden weathering storms and still remaining the frontrunner a year from now is a real possibility. The field being splintered is going to make it hard for a candidate to gain traction in ways that are really bad for their chances.
Don't be the Sanders people from 2016 who chose to ignore the implications of South Carolina and national polling that showed Sanders dead in the water, or 2016 Pundit Hat Nate re: Trump.
I would be surprised if Biden makes it through the primary completely avoiding being made to look stupid and out of touch with a statement even Boomer CNN watchers would be troubled by.