When people start to implement security at the BGP layer, which will likely occur some time soon, we will see things break. We will also see BGP fail if we don't do anything as the protocol is ancient, got an untold amount of undefined behavior between different devices and suppliers, and is extremely fragile.

There has been many that has suggested that we should just scrap the whole thing called The Internet and start from scratch. It would be safer, but I don't think it is a serious alternative. DNS, BGP, IP, UDP, TCP, and HTTP to name a few are seeing incremental changes, and the cost is preferable over the alternative of doing nothing. Ambitious security things would be much less costly if we had working redundancy in place, which is one of those things that flag day tend to illustrate. Good redundancy and people won't notice when HTTP becomes HTTP/2 that later becomes HTTP/3. It also helped development at google that when they added QUIC, they controlled both ends of the connection.