The bar has been raised again
It's cool that they've added decent support for taking advantage of the GPU oriented instances in AWS. That said AWS have just announced that they're going to provide instances with dedicated Xilinx FPGAs connected to them (https://aws.amazon.com/about-aws/whats-new/2017/04/amazon-ec2-f1-instances-customizable-fpgas-for-hardware-acceleration-are-now-generally-available/).
I know before it went to ASICs people used to mine bitcoin using FPGAs so I'd say it's a fair bet you could get some pretty serious hashes/sec out of that for password cracking. Not sure it'd work well against things like bcrypt but would probably be great against SHA-X.