As a author, this change means everybody that buy my theme can sell it anywhere else as is. I don’t think it is a really good business plan to me and Mojo might loose quite a lot of his author including me.
The reason it’s not optional is because if we did that we still would not get the full support from WordPress. There’s a lot that comes in a positive way for this change. As far as anyone buying your theme and selling it, unfortunately the same thing can happen to all of us regardless because of the nature of digital goods. We felt like the positive impact of this change outweigh any negatives.
I hope you understand and will continue to sell with MOJO. There’s a lot more exciting and big opportunities coming in the next few months besides this as well. I’m happy to answer any other questions too!