I contend that Apple has much bigger fish to fry in 2016 before rushing a second-gen RMB that really has only been in a good retail stock position since August. The Air and the Pro, for starters, they need serious facelifting, not to mention Apple Watch, Apple Music, iPhone 7, there's a lot on their plate right now. As for price drops, that's not happening at Apple, the prices are dropping at big retailers like Best Buy whose overall notebook business is plummeting so markdowns need to be taken to reduce overall stock position. The RMB is a top of the line notebook for them, it's likely tying up a lot of inventory dollars.
Agree with what you're saying but feel it's just too soon and Apple has other priorities. The slowness on the Pro and the Air tell me that they're not going to be in any rush to advance the Retina, a new model with a niche audience, when their bread-and-butter notebooks are aging rapidly. The RMB, by the way, is the primary culprit there- it makes the Air and the Pro look old as they sit next to each other on the sales table.
Yes, it's a crapshoot on timing. I still believe firmly that Skylake doesn't offer anything special enough to make someone want to delay an RMB purchase as it's got terrific battery life and it's not designed for a Pro audience. And that's what I think is going on here- you've got people who want the Pro's performance in the Retina's form factor and that's not possible yet.
BJ