I like it but I feel like it would be...too much? I say that with half halfheartedness because Sion's ult doesn't seem rewarding when you go full speed, if anything it gets harder to control. So I always felt he needed something more to reward you for going at max speed.
Some can argue there shouldn't be a reward for Sion when he reaches full speed but I feel as a player there is no need to try and use Sion's ult from across the map. Seeing as you still get the same amount of CC no matter how long u traveled. So I always thought they should,
Make Sion's collision radius ( when he hits a wall or enemy champion) larger and applying a longer slow.
I felt like this would be a nice add on to Sion without really having to change Sion's damage since, as i'm sure we know, Sion is not chosen for damage.
But this one you offered is completely viable and i can see them doing.
What if a full speed Sion during his ultimate could bust through a wall with his ultimate?
Theme wise it fits quite well and would reward Sion for going the full distance. But I feel as if they might reduce his damage on his ult because of this. But that doesn't really bother alot of Sion players, unless you pick him for the damage which alot Sion's don't.
Over all, I like this idea and support it.
