I have a headcanon (involving my other headcanon that the Helmith absorbed the original Warframes' consciousness and mind which ended up making the Helmith more intelligent, maybe even human-like?) that, even tho we seem to be able to control our Warframes' from outside to a certain degree, the Helmith is the one who protect us in situations we can't act ourselves... Like when Stalker gripped us by the throat. It became clear with 1999 that the Helmith is not afraid of us (or at least not like we thought) but instead loves us. They want us near them, they want to protect us and they want to love us. They are part of our Warframes, our companions... Our family. The reason could be the Helmith itself, like we were both used and controlled by the orokin... We were there slaves on some way... Or it could have started long before that. From my understanding the Warframes do not hate us Tenno even tho we ended up taking control over them. Ripping the most important thing away from them, their own self. The thought comes from the fact that we have a few stories telling us about Warframes protecting others and even protecting/caring for their or an Operator. If I remember correctly Jade showed a lot of kindness towards her scared Operator, being in some way a motherly figure (praise the mum warframe). And of course, there is Voruna. Even tho I believe she killed Tuvul mostly because her wolves... We know she ended up taking the Operator with her, cradling them in her arms.
I believe the Warframes knew that those kids were in the same boat as them. Tools for the Orokin, meant to suffer for their sake. They did not value their life. If we believe the Helmith absorbed those Warframes' consciousness and mind in some way... They would remember that. We can tell they are empathetic in some way. Also we as the Tenno seem to deeply care for the Warframes. We seem to collect Warframes not for our own sake but to protect them from being used by others. We also care about their stories, what happened to them and most importantly... We care for their legacy for what they used to be.
If all of this is true to a certain degree and the Helmith is still inside of our Warframes (because there must be something 'biological' inside them) then it would make sense that in some way... Helmith could still take over if it means protecting us...
Maybe I am overthinking and I am totally wrong but I am so down for the Tenno aka Operator/Drifter Warframe/Helmith relationship... Especially after everything Lizzie told us.
The bond between two people build on their shared past creating something so strong that it will help protecting others and saving the world... It sounds amazing.
Helmith, my beloved creature... My friend... My family. Together we will save the worlds, our loved once and last but not least...
Ourselves.