With some of the changes mentioned, we can potentially (depending on implementation) get a lot more flexibility in which ancestry/class combinations are viable.
Getting some ability score bonuses from classes as well as ancestry recalls the way 13th Age does it - get one of bonuses depending on your race, and one of two bonuses depending on your class, and they can't overlap - and this already goes a good way to putting more options on the table. Most iterations of D&D in the recent past have moved away from racial ability penalties, but if they're being kept, there's no reason some flexibility (like, say, letting goblins choose between a wisdom penalty and a strength penalty) can't be offered as well.
Ancestry feats are also an area where some of this can be addressed - if some ancestry's default features are especially bad for a class, a feat option that especially needs them up for it level the playing field a bit. Obviously there have always been race-specific feats that tend in this direction, but the fact that there's at least one ancestry feat slot means they're not necessarily competing with just taking the best feat available combined with an ancestry that's already good at the class.
Yeah, I like the idea of an additional feat progression based on ancestry. Too often your race pick has no (gameplay) bearing on your character throughout your progression except at the very beginning. (Rolepplaying-wise is a different story of course).