Yes, Trump has a real chance of winning in 2024 and that would be dangerous for the world in many ways.

On the other hand Trump seems like the easiest candidate for the presumptive nominee President Biden to beat.

1. A lot of Americans are rightly scared shitless of Trump and will turn out to vote against him.
2. Trump is likely to try to dodge debates which benefits Biden, who has a stuttering problem and a gaffe problem.
3. Trump is elderly, like Biden so that somewhat neutralizes the age issue for Biden.

If Trump was removed from the election DeSantis might become the front runner or nominee

1. He is young, and the age issue would be on Biden again
2. He might have the debates Trump would have eschewed and do well in them
3. DeSantis would likely pick up Trump's base in that situation

The worst scenario with Trump being removed from the election would if someone other than DeSantis became the nominee

1. Again, the age issue would be a thing for Biden again
2. The unknown nominee could be a better debater than Biden
3. The unknown candidate would have neither Trump's nor DeSantis's baggage, causing more voters to stay home or swing voters picking him/her over Biden

Edit:

To clarify, I mean what would happen if Trump was kept entirely out of 2024 - no 3rd party runs, no vote splitting.