What DOA has at its favor in comparison with Ninja Gaiden is DOA is the only Koei fighting franchise that has potential to be successful. They have Destrega but ... it was a joke.
A new fighting franchise?, that would be even harder than working hard in DOA. It should be a huge project with huge budget and good decisions like Nioh. And with Koei in the last years that only happened with Nioh.
They could also forget about fighting games but that would be doing things even easier for other franchises.
For me, what they should do is prioritizing Arcades first, like Tekken.
Tekken is still an Arcade franchise, Harada doen't forget who his audience is and that's why Tekken 7 is so popular right now. First release the game in Arcades, keep working on it for a year or two, that way they will get new Asian players (and that's precisely what DOA needs) and then start working in both Playstation and Xbox console versions. You will get earnings from the start.
Starting working in all plataforms from the beginning was a huge mistake and releasing the game in Arcades now after 5 months is also a mistake. They didn't have the staff and the budget to work in everything at the same time and releasing the game for Arcades in the middle of the WC will make the Japanese scene grow way more slowly.
If you want more tournament players, then you have to go for EU and Asia, where the franchise is weaker. Japanese and Korean players still love arcades so that's where they have to put money. EU is more complicated since only France has a big community.
They also should forget about this kind of season pass focused in costumes instead characters. It makes no sense, they are treating this franchise as a F2P game (just look at what they promote at the end of every single trailer, they are promoting Core Fighters version instead the full game) with premium cosmetics to earn money.
The world championship format wasn't a bad idea but ... if you only put money in that and not even in the game how you expect people playing something that they just don't like that much.
For a successful world tour you first need player base and they only have a solid USA playerbase. This would have make sense after working hard trying to gain players in Asia.
So, what will hapen after this world tour?. Well, numbers aren't good. Even with an official world tour and more money in the table that SoulCalibur VI tournaments, this game still get less players per tournament than SoulCalibur VI. Why?, because SoulCalibur has a higher playerbase in Asia than DOA.
Seriously, if they want to push this franchise, they have to gain more players outside USA.