I personally don't need an extra sample player, I use Halion 5 which talks Studio One's language pretty well (apart from a visual bug). But I think the concept of WyntaSumma's idea to merge Sample One with Impact makes a lot of sense. A sample player dedicated to drums isn't really necessary. A powerful (multitimbral) sample player capable of presenting its mappings area as a grid (pads) user interface (switchable) would make a lot more sense. After all the base technology and management of a multi sampled instrument and drum sample player are equally usable. You could also use the pad grid as chord pads for (multi sampled) instruments. And it would be possible to assign zones with modifiers like ADSR, Filter, Envelopes etc. per pad (something like Presence XT+ for each pad\layer). Like Zirrex suggested here: FR SO3: improvements for Impact. Add some round robin modifiers, extensive playback options, modulation matrix, playback modulators, key switch alternates, proper user friendly slice editor etc. and you are pretty much set.
This way you have one powerful device to handle any task involving sample playback, whether it's a drum kit, violin, multi sampled drum kit, percussion, multi sampled piano or a mix of those.