I think a lot of the issues brought up in
this post by
@MachinayRequiem are going to apply to most of these breakers. What it really comes down to is just making a read. Right now, if I read that my opponent is going to break, I'll d2 and get a nice chunk of damage. Not full kombo damage, for sure, but usually decent damage. And now I have the advantage next to my opponent who can't wake up. With these breakers, I have to make the same read, just with the payoff of additional damage in exchange for giving up my oki options against the meterless opponent. And if you read incorrectly and they don't break, you've still given up your kombo, but you'll almost certainly be doing less damage than if you had done a d2.
When it comes to Fatal Blows, it's the same deal; it all comes down to a read. If you read your opponent is going to FB, you can use your move to break their armor and get some damage. But most Fatal Blows are full-kombo punishable already, so if you make that same read, you can just block and punish with zero risk. Using an armor-breaking move comes with the risk of mistiming or misspacing it and getting blown up, or having it blocked and punished. But there's very little risk in just blocking and punishing.
The major issue this doesn't address is that you can still get full-kombo punished by a character who breaks out of your kombo.
And it remains to be seen, but from what's been shown so far, it seems easy enough to avoid these armor-breaking moves altogether. For instance, with Shao Kahn, he's gotta spend meter and immediately go for the break. If you see that he doesn't go for it, then you're free to break without consequence.
So, overall, I don't believe this new mechanic will significantly alter the meta and I don't think it addresses the issues that most people disliked about breakers. If anything, it just adds one more level of complexity that NRS now has to balance between characters and variations. Characters like Jacqui still get to ignore it. Characters like Skarlet will still suffer from the breakaway mechanic while other characters will benefit from these changes substantially. The more I think about it, the more I believe it was a step in the wrong direction.