I hope - and believe! - this is true.
WOTC has openly stated that one fo the goals of this revised edition is to make the game easier for new players to jump in and play. I'm not sure how far they can take that given the game that 5E is, but the changes they've announced (re-organizing content, streamlining where possible, giving more advice and examples, simplifying some terminology, virtual play) could be just what the game needs to reach new audiences.
Indeed! Now they need to write better & easier to run adventures. One way to do that, I think, is to stop editing important stuff out "for space". For example, many of the faults of Candlekeep Mysteries were (said to be) from stuff getting edited out last minute, but did it need (what was it?) Thirteen Adventures in it? What would have been wrong with 7
good ones? Do the HC Adventures need to go 12 levels? Why not 5-8 levels of Adventure, with much, much more detail (and DM-assistance) fit into its page count. They could also use this for synergies in products by making higher level sequels down the road.
Now, I know that higher level adventures don't sell as well as lower ones (for example, I have numbers on how well Rise of Tiamat sold compared to Horde of the Dragon Queen. (At least at my own store). Not good, in spite of having generally better reviews.
Still, I think that's due to other factors than JUST the level-thing. For one, I'd make higher-level "sequel" adventures stand more on their own. Not the second half of a single adventure, but a thematic sequel that could be run after the first one, OR be run on its own, OR be run after a completely different adventure.
Also: Plan to put it out a few years later, not as the very next book. You gotta leave your fields fallow for a season if you want them to grow well. (If you get my farm analogy).