I think you are placing too much faith in your perception of what people think.
Why would anyone in the top 50% vote for it? There is little gain for them.
Why would anyone in the next 10% vote for it as they will be moving up soonish if there are promotions with a new type and therefore little gain for them.
That's 60%.
I would be very surprised if Is Don's prediction comes true. And it is true that not everyone is senior, but not enough are junior.