I agree. Trump has certainly earned a landslide, but it won’t happen for all of the reasons that you cite.
Still, if you start with conditions for a landslide, and we all do our part, he should still win comfortably.
Another cause for optimism is what I think will be a considerable drop in the Libertarian Party voter percentage next year. In being an anti-regulation and lower tax President, and the least likely to get mired in foreign wars of any President since Jimmy Carter, or maybe even Grover Cleveland, he has accomplished more of their agenda of any President since Reagan, maybe even Warren Harding. If Trump received even half the votes Gary Johnson got in 2016, he would have carried Colorado, Maine, and New Hampshire. Also, there won’t be the McMullin independent candidacy, which cost Trump no states, but cost him about 730,000 votes, mostly in Mormon country. Mormons will revert to the GOP, their home for a century ,
If the Libertarians slip back into the sort of numbers they historically receive, and there is no McMullin-type independent, Trump’s reelection chances are good.