Personally, I really think they are different markets / targets (as an overarching statement).
I've never had any interest (and still don't) in the Spyder line. They are way too "touring" focused to suit me, the closest I've ever owned to a touring machine is a Ducati Monster, lol.
The Ryker on the other hand is a 3 wheeled fun machine that caught my interest the minute I saw it. To be honest, I wrote it off at first assuming pricing would be way higher like the spider line. Started doing some online research and put a deposit down later that week...
I there there is a portion of the population of Spyder owners who will also have interest in the Ryker, but I have to believe there is a much larger population out there like myself, who wouldn't be on 3 wheels at all without a machine like this. Smaller, lighter, sportier, a "toy".
They are pulling new people into their fold, which is an awesome move.
Resale on used I'm sure will be very reasonable. These shouldn't depreciate much more or less than any other sport oriented bikes. The next few years will probably bring decent used money until more get out into the used marked, and like anything else it will depend on what the market will bring in any given area.
I also have to assume that they are trying to force some into the used market by offering and seemingly pushing pretty hard on leases. That's a great way to get some used on the sales floors relatively quickly.
Given the price points being what they are, I can't say that resale value really came into my mind as a part of the purchase decision.
What about the Ryker resale value???
My opinion is they won't be very good.
Also when I was at the dealership over the weekend they had the Ryker lined up next to the Spyder's, and they look like a little big wheel compared to the Spyder's when lined up the way they had them at the dealership. What stood out to me is when you look at them next to a Spyder my 1st though was you get what you pay for, there is absolutely a reason the Ryker has a cheaper MSRP. You can see that plain as day.
The Rykers in my opinion will not hurt resale value to Spyder's. They are in a class / brand by themselves. Someone else mentioned the styling won't appeal to all. I don't see the Ryker as comfortable (you can feel how small it is), and or good looking in the least bit. I like the RS-S style seating position / foot position, & a super sport bike look.
I wouldn't be concerned with the resale of Spyder's, but the Ryker I would recon you will be able to pick these up used for cheap in less than 4 years.