At this point, "Switch port when" is going to be a thing. While people laughed off the idea of many major multi-platform releases hitting the Wii U, we're already seeing huge players like Wolfenstein and Doom arriving on the Switch, so it's only a matter of time for a lot of publishers.
For Capcom, Monster Hunter World on the Switch right now just isn't an option. Speaking to IGN, directors Kaname Fujioka and Yuya Tokuda explain that they "don't have any plans for the Switch at the moment," mostly because of how much time it took to develop World in the first place. According to Capcom they've been working on the project for almost four years, and had to commit to specific hardware, and they decided this "before the Switch was even announced or on sale."
So there you have it. With the PC release delayed until later in the year as it is, Capcom has its hands full already. Now I still think that there's a distinct chance for the Switch to get in on the fun with the inevitable "Super Ultra X" type release, because you just know Capcom is going to iterate on World as long as they worked on it.
Monster Hunter World Devs on Switch Release, And Pleasing Hardcore Fans [IGN]
via destructoid https://www.destructoid.com/capcom-says-monster-hunter-world-isn-t-launching-on-switch-because-it-s-been-in-development-for-four-years-484021.phtml