This isn't going to solve the problem of bankstanding waiting for a +1. The issue has always been not enough people willing to learn the content; however you'll find plenty of people doing tob on bonuses. I don't believe we should keep nerfing this piece of content to incentivize more people to do tob more often.
No support.
I get this take, but I also think there is a line between actually nerfing content mechanics and reducing HP to support a smaller group. If ToB mechanics worked the same way they did years ago when you could blindly tbow verzik, didn't have to tank, didn't have to swap prayers or use any tech at all I wouldn't make the suggestion. Reducing boss HP in a duo isn't going to change the fact that you still have to learn ToB. This isn't really aimed to support the people that aren't willing to learn ToB. It's for the people that want to ToB outside of bonus or during lower traffic play times.