Wild theory, but I wouldn’t be surprised if they change to iced-rs when they realize they can’t do the work needed to get elf to do exactly what they want, and instead can ride off of system76’s insane development accomplishments in their new rust based ecosystem of desktop components.
Reasons it might happen: the blog post specifically mentioned wanting a new ui-toolkit that worked well with rust or go, but at that time s76 hasn’t announced or dived into developing iced-rs more. I think it even mentioned hoping that s76 would build an alternative.