I'm not convinced any of the HuCard RPGs released in Japan would've put up good competition for SNES or GEN RPGs.
Although I don't think RPGs of any kind would have made much of a difference, by this rationale, NEC/TTi shouldn't have bothered releasing any Bonk games or really, most Turbo games.
No, I don't think any RPG releases would have changed much, but what I'm saying is, while the CD RPGs were sometimes competitive in audio and visuals, the HuCard RPGs appear to be overly simplistic, and would not have been able to compete on any level with the better RPG titles being released for the SNES and Genesis at that time. But CD RPGs wouldn't have helped much specifically because of the limited ownership base of CD units. Further, RPGs require a LOT more translation work.
No, I think many of the titles released by NEC and later TTI were, in fact, appropriate titles to release. The failure of the TG-16 in the US was as much that the games on the platform simply didn't hold as much appear to American gamers at the time as it was that NEC under-promoted the system. So many major developers weren't developing for the PCE despite how well it did in the Japanese market. Capcom snubbed it complete, choosing to license instead of develop directly. Capcom DID develop for the Genesis/Megadrive, even though the MD did miserably in Japan. Konami released some good titles on the PCE, but it could have done much more.
I'm not convinced the TG-16 was capable of doing well in the US. Does affect how much I love the system, but even if NEC had promoted it more, or if Nintendo hadn't engaged in anti-competitive practices, I'm still not sure the system would have found success.