A quick check to my routing table suggests that I have 206700 preferred routes (v4/v6) to notfound (unknown) destinations. So yeah I don't think anyone can afford to do this right now.
I don’t think anyone can afford to ever do this, regardless of the number of unknown destinations!
Imagine not being able to reach North American destinations for 23 hours because of a cryptographic signing issue at the RIR [0] causing all ROAs to blip out of existence.
Kind regards,
Job