I say it's a good move for Japan and not necessarily a bad move for everyone else either.

It's way past time that new generations stopped paying for what their forefathers done and started playing on a level playing field with the rest of the world. From a more selfish point of view, having another couterpoint to the rising might of China can't be a bad thing either as long as they don't start beating on each other.

United States has grown far too large to ever be forced back into the status of second tier power
I hope you're only talking about the near future, if you're talking about forever then this smacks of arrogance and not learning from history.