Sure lets replace a shitton of stats we get from elder now with a skillshot execute. I wonder if it will have to be quite strong to compensate for its unreliability. The unconditional unmissable execute they plan to add can be really weak, like 5% hp execute, it will still be worth to risk taking elder for. Skillshot with cd will have to be 10-15% hp strong to be at that level. With this people will die even faster.
Also lets put it on separate button. People play 10+ games without even seeing an elder dragon, but they need to dedicate a whole new button for it. And its not just a "fire once and forget" button like B for recall, its a spammable(5 sec cd) button that is used during teamfights. Am i the only one who thinks its a bad idea?
Also, we don't even have numbers, what are you going to balance? Execute at 90% hp is too strong, execute at 0.1% hp is too weak, somewhere in between is the "balanced" value. If what Riot bring to us ends up too strong, it can be nerfed in value. Or the dot itself can be nerfed.