Broadsword is probably going to have a power replaced, just like Battle Axe did, so that’s not a useful example.
Reordering Martial Assault would certainly help.
I don’t see how they could buff caltrops to make it worth being a t7, nor do I see how they could buff it to make it worth being in an assault set. They aren’t going to turn it into a good damage ability.
Sometimes powers have to be replaced. There’s plenty of precedence at this point.