The point was that even a small miner who already had one (hopefully someone bought it waaaaay earlier) could leave it hashing away even if other people jacked the difficulty up to 1 billion later on, which presumably would take quite a long time being a Three-Thousand percent increase in difficulty/hashpower and still make monies.
Agree. Paid for devices can be profitable for a long time. It will be interesting to see how fast ASICS sell after the difficulty rises from the first few batches. It does seem to be a "get in early, or watch from the sidelines" game.
Keeping it on-topic (Or my first on-topis post in this thread

): Nice write-up, Angelus..