"RE4 on the go" is a pitch that sells itself SO EASILY... Surely the suits at Capcom realize this. Doubly so, when the Nintendo core fondly remember RE4 from the GCN, where it started, and would gladly revisit it in HD.
Granted, I'm one of those people, and I own RE4 on GCN, Wii, PC, PS3, and PS4. But I'll gladly buy it a sixth time on Switch! It'll be the first copy of the game I have that I can play anywhere at anytime!
And then, Capcom should bring over the sequels: RE5, one of the best co-op shooters ever, and RE6, which was criminally misunderstood at launch due to its middling campaign, but has the best combat and mobility mechanics of any TPS ever, something that truly shines in Mercenaries.
I think Revelations HD and the (surprisingly heartfelt, disarmingly sweet) Revelations 2 would also do extremely well on Switch, since their episodic campaigns and super-addictive Raid Modes are perfectly suited to the Switch's "anywhere, anytime" model.
Resident Evil is my favorite series, pound per pound, and action RE is my favorite flavor. Gotta have 'em all on my Switch!