To be honest, the problem with motion controls being "Hardcore" is that "hardcore" gamers generally want to game a lot. 12 hour power sessions and "oh wow, I forgot to sleep for work" and such are the much parodied hallmarks of a "Hardcore" gamer, whether it's an RPG fanatic, or someone engaging in huge numbers of shooter deathmatches.
The problem with a motion controller being "hardcore" among other things is that nobody is going to be able to get up and spazz out for 12 hours with a motion sensor.
Also, I tend to agree with the choice of titles. Pretty much everyone who saw the Wiimote thought of it's potential for sword fighting games and the like, and truthfully nobody has really exploited that well (most attempts have been lacking). Others have looked at the potential for interactive violence in games like "Manhunt 2" (which was never truely explored as far as it could have been) and similar things. Indeed it seems like the anti-gaming crowd freaked out about this kind of thing to the extent where game companies were afraid to really run with it, which is in part why I feel the Wii never took off beyond a casual market. Even games like "Madworld" are a pale shadow of what they could have been with that control potential.
Even getting beyond the "how do I play all day with this" aspect, I have yet to see any evidence of Sony being willing to become the company that is going to mount it's white horse and do a massive charge against international game censors and watchdog groups to "free" motion control enough to be used for "M rated"/Hardcore gaming of that variety.
I mean sure, I could see torturing "people" with a remote like that in a horror game, or using it to get into some deep knife/sword fighting action (perhaps even online multiplayer) but I am not sure if the guts exist to do it right.