Do you mean progressively weaker score increases versus progressively better feats as characters level up? That jumped out at me too when I read the article. Right now it sounds like it wouldn't work but we don't have all the facts yet.
If they made the bonuses +1/+1 to two different ability scores with the option of +1 and a feat, I think you solve a lot problems. You still would probably need to find a way to give the Fighter and Rogue more stuff, but they should probably eyeing turning the best feats that best fit the flavor of Fighters and Rogues into class features anyway.
Actually, there is an easy-but-not-simple cop out the dilemma of balancing stat increases vs feats : monetary fungibility, aka point buy : you just assign a buying power to each and every slot, and a price to every boon. We already know the price for stats via point-based chargen, we "just" have to assign a proper budget to each level-based increase, and design/price the feats correctly.
Pros : easy to balance/design (even if we never see such a system, I guess the designers will use such a system as a guideline)/splat/adjust via errata
Cons : Fiddly / are we playing GURPS or D&D ?
What if we had 3 tiers of feats and ability bumps, a bit like heroic/paragon/epic? Perhaps a tier 1 ability bump grants +1 to a single score, tier 2 grants +1 to two different scores, and tier 3 grants +1 to three different scores.
That will tend to mitigate the possibility of ability score increases that don't do anything, but doesn't help us resolve higher level ability bumps being relatively less useful to the character (assuming they've been bumping their primary 1-3 scores) while feats presumably get more powerful.
This would grant up to 16 ability scores increases (same as +1/+1 8 times) .....
But the whole point of the +1 stat is to make feats optional. If you make it a choice between a feat (which includes a +1), and just a +1, that's not really optional.
No its not. Who in their right mind would pick a +1 to ability score over a +1 to ability score and an ability?
Naaa, they would take feats that grant increases to abilities they want. Then they would complain they had to take feats just to be effective charactersFirst, those who don't want to play with feats at all would use the +1 to ability score universally.
What cleric wouldn't ever take this?Alertness
Benefit: You gain +1 to Wisdom and cannot be surprised.
Which would you take?
I don't think trying to make each feat universally useful is the right way. It's okay to have some choices useless to you. As long as you have sizeable amount of options, and as long as each option is useful to some characters (more than one class or race, for example).If they can find ways to create universally useful feat choices that aren't "+1 to X" I will be pleasantly surprised.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.