Posit: People think IPv6 might be poorly supported.
Consequence: People go all-in on IPv4.
Result: Nobody bothers to deploy IPv6.
Conclusion: You can make protocols fail.
Bzzt. I've already done that. Maybe you've heard about a few? Think bigger.
MySpace?
Yes.
Digg?
Yes.
Forums?
I might even be able to crash the whole damn system.
Inspired by @jima