AFAIK, there is no alternate routing protocol in wide use to switch to. The problem isn't actually with the protocol, which seems to be a reasonable way to advertise routes.

The problem is how do you know which routes you should trust. Most ISPs should have a reasonable idea of what netblocks most of their customers should be advertising and should be filtering there; but between large ISPs, I don't think there's a reasonable way to determine if you should trust a given advertisement for a small block. The owner could have gotten alternate transit, or sold the block, or many other things.