There is still the question of what the default behavior should be. Here is a proposal:
Ignore blocks that take your node longer than N seconds to verify.
Ignore blocks that take your node longer than N seconds to verify.
That's nice. Just don't forget to include total download time in the "time to verify", as well as any other I/O time. Bandwidth will be a significant bottleneck once blocks start getting larger.
EDIT: Oh, and of course, there must be tolerance levels too (if I'm X blocks behind the chain I once rejected, I'll give up and start building on top of it). You don't want to create that many chain forks!
