I can tell you with certainty that we will NOT be waiting even 2 hours in STANDBY for a 20 minute light show, and I don't care how much they hype it. I'm thinking that since we are still planning to be at AK on our designated night, we'll just take advantage of the fewer crowds (cause they are all standing in line for ROL) and do the other after-dark attractions. If a FP or dining package magically (and memorably) materializes, great, but otherwise, we'll see it next trip.
And that's my final answer...I think.