In the end, neither of these systems will be viewed well in the history of gaming.
Your entire post evidences a fundamental lack of understanding regarding the video game industry, its history, and how it functions.
The Wii is going to be quite collectible, but it will take time for it to reach that state. (just as it did with the NES, SNES, and basically every other system before it) Anyone with a longer perspective can tell you how these trends work, and how they will likely play out with the Wii. While hard-core game enthusiasts scoffed at the Wii in its own time, millions of younger and casual fans flocked to it in droves. In another decade and change, the nostalgia factor will start to kick in, and enthusiasm for Wii games will start to rise.
The hardware for the Wii will never reach the level of the SNES, but it will likely be comparable to the NES. For the hardware its usually just a matter of supply, and there are a lot of Wiis on the market. Nintendo hardware is notoriously durable. (and not poorly designed as some claim) The Wii's hardware platform is similarly robust. It won't be as long-lasting as the GameCube. (a veritable tank) But the average Wii will likely hold up for decades, perhaps longer. So once the Wii starts becoming more collectible, the hardware itself will be easy and relatively cheap to acquire. You'll never see old Wiis going for more than $100. They will probably top out around the $70 mark.
The games are another matter. While there's plenty of shovelware for the system, there are also a lot of instances of critical darlings that got smaller print runs. Often this was because some of these more gamer-centric titles didn't target the casual demographic that the Wii was known for. Many of those titles are already seeing price hikes, especially the third-party ones that are not likely to get best-of reprints.
The Wii U had issues, but none of those were due to its specs. And the Wii U is going to easily be twice as collectible as the Wii. It's short lifespan and diminutive numbers are going to make it one of the hottest items in the collectible community. It's not going to see this enthusiasm bloom for another fifteen years. But its going to happen. In twenty years, the Wii U hardware will be selling for more than its current retail price. Guaranteed. It's a niche platform from a storied developer, with unique experiences and a bizarre hardware setup that is not easy to emulate. Guaranteed collectible monster. Low supply on the hardware and games is going to drive the collectible prices through the roof. If you're a game collector, you need to jump on the Wii U RIGHT NOW.