I used "Dems" in the title due to title length limitations. There's no need for you to keep repeating it.

Oh, it wasn't a criticism of the abbreviation. I put "Democrats" in quotes, because the idea behind this is that there exists some group of people - "Democrats" - that have the power to pick a new nominee. There isn't. If "Democrats" refers to the voters, they only get to choose between Biden and some minor-league candidates who can't possibly beat Trump. If "Democrats" refers to the DNC, well that's mostly controlled by Bidenworld at this point. If "Democrats" refers to the more politically prominent members of the party (Pelosi, Schumer, Jeffries, etc.), they don't have either the power or the inclination to force Biden out, or even to try.

These article always have an amorphous subject - some "they" or "Democrats" that ought to do something, without really specifying who has the power to do that. But there is no subset of "Democrats" that can or would do that. For a fairly good summary of why, consider this article as counter-point:

politico.com - Get used to it biden isnt going anywhere

That's what the article suggests: he should withdraw.

But he's not going to. To quote from the above article:

If not one Democratic governor or senator is willing to even publicly question whether Biden should run, how would he feel any pressure to change his mind? And even if they did speak up, they’d still be faced with the unpalatable dilemma of choosing whether to embrace or reject Harris.

Nor, quite frankly, would it be good for Democrats if he did withdraw now. It's too late. Because there isn't time for the voters to pick someone other than Biden (ballot qualification has already passed for something like 80% of the primary/caucus delegates). And there isn't away to get through an open convention and end up with anyone better than Biden. Articles calling for a change in candidate rarely engage with the damage that such a process would inflict on any candidate that managed to get to the end, which is why there's an excellent chance that Biden withdrawing just ends up with Harris (the only candidate who is certain to put her name in for the convention knife fight rather than wait to 2028).