I've been following the discussion on the x11 thread (
https://bitcointalk.org/index.php?topic=556277.180 ) and there were two interesting highlights - at least interesting to me:
1. A guy estimates that it'd take a few months and a 50k cost to roll out ~300MH FPGAs for x11, with 2k per board cost:
https://bitcointalk.org/index.php?topic=556277.msg6077250#msg6077250If this happens, diff will make block reward go to 5 pretty quickly (and reducing the number of coins perhaps?)
2. Scrypt-N is already ASICable with an ASIC miner that seems to be able to handle N-factors up to 35 years ahead:
Also from their faq:
Can Neon mine for Bitcoins?
No, unfortunately Scryptr is dedicated and optimized for Scrypt mining and does not have a dual-mode
Can Neon support mining for Scrypt Jane or Darkcoin?
Scryptr is designed and optimized for Scrypt mining and not a general purpose mining chip. For Scrypt Jane, only a small subset that uses a combination of SHA256 and salsa20 mix, but in general no. Darkcoin definitely not.