Maybe? But it's not like the two games are competing on the same platform. I imagine there's more than enough room for both in their market share.
The MH base on the west is (relative) small, but dedicated. The 3DS localizations were modest suceses. IDK if there's enough room for both if MHW fails to capture a bigger market.
For example, me: I don't currently own a Switch, but will probably get one by the end of the year. If MHXX doesn't get localized before MHW, I will probably just be waiting for a Steam sale of MHW for my MH fix, instead of getting both games, which I would very likely do if it released this year, for example.
And if the PC version of World version is delayed significantly, I won't be paying full price for it. :/