It's exactly the opposite:
Shieldgating is the only survivability tool for anything above base steel path.
You can't mod for health and armor, because the enemy damage values FAR exceed what you can achieve, so if you have 50hp or 5000hp makes literally no difference at all when approaching around enemy lvl 1500 and that is based upon SINGLE hits, not accounting for multiple hits. For the very same reason, shield stacking is beyond useless, even if they would buff the shield DR from 25% or 50% to 75% or more. It's all the same, when the enemy bullet damage exceeds hundreds of thousands of damage compared to your measly 1-2k shield/health you could cobble up by sacrificing all your warframe slots for those values.
And this is what this boils down to:
Nothing will change at all in the meta, because there are literally no options other than shieldgating to play in those enemy level ranges/level cap. The bottomline is though, all frames with no shield gimmick (speaking hildryn, protea, condem etc.) are stripped by 1 whole warframe mod slot, which are already VERY tight on every frame, because they need to slot in the new mod to revert shield gating to it's current form.
Now, before those andies roll in with their argument of "bla bla but only 0.1% of players play this content".
That is still 0,1% of us that get royally screwed over for no reason at all. There is no compensation for the nerf, no alternate way to go around it, it's just straight up you lose one warframe mod slot across the board and they didn't even care to make the shield gate mode an exilus mod to soften the blow a little bit.