Magi is currently airing in that block and it's a traditionally shounen block... I guess Yamato could be a show that boys might like though. It is an interesting money saving measure to buy a show that already exists rather than pay for a new show to be made though.
I guess it's like what people thought would happen with the last US writer's strike... which never really happened except with one or two Canadian TV shows airing on US TV for a few weeks.