1. Can't cancel/rebook after final payment dates (one is 7 weeks away, other is just about 120 days).
2. Adjustments after final payment are FCC. I'm sick and tired of FCC and would rather deal in terms of actual cash.
3. Selection doesn't matter, planning on getting a sail-away cabin and maybe go for a bid upgrade.
Downsides mitigated, but I don't disagree with your reasoning. Would try another line, but have to finish up last CruiseNext coupon and remaining FCC before end of the year.