For months running I've consistently expressed the opinion that this precise scenario would unfold - namely that Trump will win the Republican nomination for President by a landslide. Why? Because of the factors you mentioned which have long since been known.
Trump has a locked-in 30% or so of Republicans who will vote for him no matter what;
The Republican field will be crowded - diluting the anti-Trump vote;
Legal proceedings against Trump will bolster his popularity among some Republicans, further increasing his edge over contenders.
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I've also long stated that this is excellent news for Democrats. Trump is such a divisive a figure - and growing even more so - that he's very unlikely to win election to the Presidency. Furthermore, his mere presence on the ticket will detract from downstream Republican chances.
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Finally, a more recent prediction of mine, is that Democrats will benefit from a huge Blue Wave in 2024. I think that voters are fed up with the divisive "own the Dems" rhetoric of the MAGA party. Another big factor is that the overturn of Roe by the MAGA Supreme Court is enormously unpopular. Finally, Republicunts are on the wrong side of every single social issue I can think of: gun control, LGBTQ rights, abortion, vaccination, climate change...
The only way I foresee that a huge Blue Wave fails to manifest in 2024 is that the economy worsens substantially and that Republicans are able to capitalize on this.