sure, you should have a plan. For starters have the base races, classes and subclasses in the first PHB(s), probably modeled after 5e or the revised PF2 (with 2 player core books)
Then add races / classes / subclasses every two to three years to broaden the base. When you have done that two or three times, you probably have everything you will ever need, more becomes detrimental.
At that point the only thing you can still do is revisions, much like 5e 2024 does
You can tweak this a little, it’s not like I thought about this extensively, but that would be my starting point
Adding races, classes and subclasses every 2 years is too slow to many money.
That's what I'm saying.
After the initial PHB with 8+ races 10-13 class, MM, DMG...
you need a minimum of 3 crunch books every 2 years to sustain hype.
D&D's main draw is content and fanbase. Quantity over quality.