I was wondering what bikes made these days will be collectable in 30+ years?

A few used road bike trends I've noticed in the industry are; Trek OCLV carbon bikes before being called "Madone" seem to have lost value quickly, Cannondale CAADs keep it well, and cyclocross models seems to have past model interest.

Chrome frames seem to always be of interest so my throw out for consideration: 2014 Soma Rush.

that is all.

I think if it's european and carbon from 2005-Now, it'll have future interest. Not to be biased on my La Pierre Xelius, but 9s Ultegra Look, Time & BMCs seem to go for higher prices at bike-swaps than 9s Dura-Ace Specialized and Giants.

As for mountain bikes, that's a tough one to determine. No 90's MTB seems to have any value besides being a hybrid these days unless titanium.

Unusual designs
Hi-end (expen$ive) models
Popular models (people will buy when the nostalgia bug bites)
Small volume specialty makers

I believe that only the top-of-the-line models might gain collectible status, but I'm not even sure of them.

80% of the carbon bikes today are made in China, in one huge factory. They are all CAD and made by machine, not man. Hardly the stuff of the artisans of the 60's, 70's, and 80's that make steel frames so collectible. I also think they are rather ungraceful and look out of proportion to it's rider. I don't think they're looks will stand the test of time like the graceful, proportioned, almost fragile looking steel frames do.

Top-of-the-line bikes might make it, because they are built in the country of origin, not China. But again, looks are a problem...IMHO of course!

Kestrels that are already old.

Wraiths.