IMO still incredibly unlikely on account of no particular incentive or interest from Nintendo (as of now, at least) to promote the series as it has never been in a single Nintendo presentation. In general the series is not in a great, accessible place for a worldwide audience who, outside of a small underground group, is not familiar with the series outside of a few songs they've probably heard in meme videos. Translations are mostly handled by fan patches among its western fans rather than official localizations - which would go a long way.
If it comes down to new series / characters that would appeal dominantly to a Japanese audience, Nintendo seems to have a lot more stock in Monster Hunter and Puyo Puyo, which both have a more notable and more properly supported presence overseas to boot. There's "isn't that big in the west", like Terry, and then there's "you need to hunt down fan translations to patch onto your game" which is a whole other ballpark IMO. Once Touhou sees more consistent, official western support and starts getting pushed by Nintendo as this "hot in Japan series that you gotta check out" (which is what they've done with Puyo, for example) then I'm really not seeing it at all.