There's absolutely no intelligent for future Metroid games to copy anything Other M and Federation force has done. A fresh different start for the next Metroid game would be a good idea (in my opinion).There's absolutely no reason for Metroid to copy what Breath of the Wild did and compete with a fellow IP.
Of cause it's lacking the charm of the older Zelda titles. That's the whole point. BotW is charming in a whole different and amazing way. Those who want an Ocarina of Time clone in game style or charm will be disappointed by BotW. That's the whole point though. Every Zelda game from Ocarina of Time to before BotW is based off the Ocarina of Time model. BotW is a new model, and intentionally so.Just like Breath of the Wild. It may have gone back to its roots, and for the better too, but other aspects that made the franchise great to many are also lacking for the sake of "changing the conventions" and while most people still enjoy the game as a whole, more and more people tend to share the sentiment that it is indeed lacking some of the charm and concepts that brought them to the series to begin with.
That is correct but you need to focus of the successes as well as the flaws. BotW does a heck of a lot right. Sequels of any game should improve on the good parts and work on the flaws of the previous game. The Ocarina of Time sequels did this poorly because as time went on they got more and more stale. Skyward Sword is a prime example of this.Nintendo's next goal shouldn't be how to be more like Breath of the Wild in the future, but more so, how can they implement some of those missed conventions into a massive and fully explorable world like Breath of the Wild.
What I said about Metroid is nothing to do with trying to clone BotW as a Metroid game. However there is nothing wrong with learning from other IPs. What you need to realise is "what something it not" in your words could also be called "a new and innovative direction for the IP". If you never think outside the box and challenge the traditional conventions of an IP, then that IP never changes and is forever stuck in the past. BotW is only what it is today because Nintendo dared to challenge what a Zelda game should be. The same needs to happen with the next Metroid game.It's the same for Metroid. As long as it continues to have top notch game design, great gameplay, and stays true to itself, there's no need for it to try and bank off the success of a different franchise. Nobody wants Metroid to return as something it's not, nor does that mean we don't want to see the series evolve.
There is only one thing every game should have/be. That is fun. Everything else is subject to change in the hopes of making a better game. Being too fixed on what an IP should be or should contain can prevent you from seeing possible potential that does not fit within the current constraints of that IP.