With the SNES NSO library out, I'd hope for The Legend of the Mystical Ninja (yes... the one with the WRONG names
) to be added so to get the gears turning. Alternatively, Konami could put in some effort and release a Ganbare Goemon/Mystical Ninja Anniversary collection like it did for Castlevania, and Contra, and bundle the aforementioned game, along with some of the other games from the series that never got localized.
Possible Anniversary Collection titles
Ganbare Goemon! Karakuri Doochuu (Famicom)
Ganbare Goemon Gaiden: Kieta Oogon Kiseru (Famicom)
The Legend of the Mystical Ninja (SNES)
Ganbare Goemon: Sarawareta Ebisumaru! (Game Boy)
Ganbare Goemon 2: Kiteretsu Shogun Magginesu (Super Famicom)
Mystical Ninja Starring Goemon (Game Boy)
And, if they feel like going the extra mile, they could add,
Mystical Ninja Starring Goemon (N64)
Goemon's Great Adventure (N64)
Outside of an anniversary collection, it'd be nice to get a localization of the DS game.