Here on the Gameplay forums, we make outrageous claims on Soraka's viability on PBE
Let's go ahead assume all changes are completely gutting her, she will be trash with the power shift, and make her 'less fun' and 'less interactive'.
I mean, she's already complete cancer in her current state, makes the lane completely passive and makes you want to /wrists just by facing her in lane.
God forbid nerfing the things that make her stay in lane until you surrender will change the way you have to play against her, and we definitely aren't going to discover that past the first two games you play today with her in it.
It's PBE, and its there to TEST shit. Not to push to live immediately.