Metroid 1, 2, 3 and to a lesser extent, Fusion, ZM and Samus Returns are what Metroid fans want. The problem is that the genre of Metroid games was significantly changed after Super Metroid. People have a hard time recognizing this, because while they can recognize that they really like Super Metroid, they have a difficult time defining precisely what the genre of this game is.
I believe this is why fans have coined the term “Metroidvania.” Koji Igarashi recognized that Metroidvania stands as its own unique genre. Fans realize there are some key ingredients that they really appreciate about the genre, but they are integrated into the experience so seamlessly, that it’s really hard for people to pinpoint exactly what those ingredients are.
Likely even Nintendo doesn’t know precisely what it is that made Super Metroid so great, and this may be why we haven’t seen another 2D Metroid in such a long time. The producer of the series was Gunpei Yokoi and he died after Super Metroid was completed before any Metroid sequels were made. Making Metroid without him is like making Megaman without Keiji Inafune. It can be done as we’ve seen with Megaman 11, but it took a long break and there was a lot brainstorming that had to be done to figure out what made the series great.
There is definitely still a market for this type of game as we are seeing a resurgence in this Metroidvania genre through the indie developer market.