It's hitting a place in the market where a segment of folks are bored with 5e (and, really, 5.24 doesn't look super different at this point ) but those people want that 5e-but-better experience. Whatever better means.
...and then there's the segment of people who are just kind of overwhelmed by Pathfinder 2e and don't want that level of crunch.
For whatever reason, at this moment in time, people are looking at DC20 as an appealing option.
(Meanwhile, proven commodity 13th Age 2e ended with $374k, probably a 10th of what DC20 will end up doing. That is... interesting. People are looking for the Next Cool Thing.)
Good timing on this, too. Right as con season gets into full swing -- I expect during/after Origins DC20 KS will see a bump -- and before the new edition D&D hammer hits late summer.
Do I expect people to be into this game in 2 years? Maybe! I've been down this hot-new-heartbreaker road 3 times before (though metrics were different) and these games don't end up getting much played past the initial release. but stuff can be niche and respected and find its audience base.
Games need community to get played. They need a certain level of player base to get played. (which is why MCDM RPG with 30k backers, actually feels like they have a community big enough to be self-sustaining).
Thing is, Dungeon Coach is a one-man operation and I think is totally unprepared for this. I've been watching his videos a bit of a couple years and a multi-million dollar KS is totally going to overwhelm whatever plans he had. Will there be supplements and adventures, etc.? Maybe but I wouldn't expect anything soon. He had no plans to become a game company publisher and actually start generating stuff on such a large scale.
In any case, good problems for him to have. Perhaps not great problems to have for people investing in a new fantasy RPG that they expect to be supported.