You're kidding, right? After seeing what the Vita sales have been like recently, do you honestly think no one will show up for one of the very last Wii U physical copies to exist? Systems that are already dead do not make for less demand on collectible games. And a lot of the recent Vita games haven't even been that notable. Axiom Verge is extremely well known, and its Wii U release has been rumored for years. They could sell out 6000 copies blindfolded and with both hands tied behind their back. It won't even be a challenge.
The Wii U had a very small install base. But it is now one of Nintendo's most collectible systems. Prices for new-in-box Wii U's have already skyrocketed. This time next year game prices for the Wii U are going to be sky-high. The LRG release of Axiom Verge will sell out in minutes, if not seconds.
Unlike most people around here, my comment came from actual experience of selling Wii U games once the NS had already taken off, and that market is all but dead, except for the most rare of titles. Could AV be a anomaly, sure, anything is possible, but a quick search of Ebay today shows game prices for most big name games are $20 and under(new and sealed). The "N" branded ones which never see retail drops, are in the same boat, as the market went to the NS. The market looks worse now than it did about a year ago when I sold games, as Splatoon and DKC & MK where still in the $30 range.
Yes, the system is selling at high prices, as it's the system and that has nothing to do with the games. Most Wii U sold to young kids, and got beat to shit, so the market for collectors is very small for new inventory are like new condition. Games rarely if ever fall in that category unless demand is high and qty's are low. I think if the Wii U was region free, they would still have a hard time moving 6000 games, but like I said, I could be wrong and stranger shit has happened.
Comparing the Vita to the Wii U is apples to oranges, as one was well beloved and got support to even this day, while the other only had 1st party support, and they even threw in the towel. The Vita is region free and has many games produced in low qtys, and I can speak to this as well, as I sold most of my collection a few months ago, and did amazing for some stuff, and couldn't give standard US released games away. I'm actually getting ready to relist my unsold stuff, as the Vita market has gotten silly within the last few months and I may do better at this point. But a quick look at Ebay shows the Wii U market and besides systems, and a rare game or two, you cant give those games away anymore.