This would be a nerf in some regards. It would turn into a Sejuani passive and the damage would become useless. It would be easy enough for anyone with CC to activate it long before a fight, meaning you won't even have it up when you want / need it. Kind of like a really bad version of Banshee's Veil. Not a good idea if you're trying to make it more accessible to other champions imo, since it will ruin it for a lot of others.
Unfortunately, I'm also not sure what we could do to make it a viable option for others while also keeping it effective on people who already thrive with it.