well there most wii fans that wont admit it, but there are to many good games on HD consoles to think that someone with only a wii is a hardcore gamer, how can someone not have games like gear1/2, assassin's creed, metal gear, gran turismo,final fantasy 13, etc and call himself hardcore (most hardcore last gen did ok without zelda and mario)???
when i ask people that own a wii why they have one they say "is fun to play bowling when people come by", that is not a hardcore gamer expression (this is not a bad thing), anyway, i do believe that wii is in a different market, the thing is sony and MS have found out there is a lot of money in the market nintendo have created(or discovered) and they want some of it, but that market is so different that when a hardcore gamer sees elements of like the ones on the wii in a hd console they complain, lots of people have complained about the new casual friendly xbox interface, and many hardcore didn't like LBP because it looked casual. The thing is hardcore gamers are rejecting things that are considered casual this may put the company in a position where they have to decide, if go the nintendo way or not.
At the end if you have a ps3 or 360 you may buy a wii (or the other way around) but i you have one hd console the probabilities of you getting another hd console is very low, that to me proof that ps3 and 360 satisfy different markets than the wii does, we can call that market what ever we want, casual , half hardcore, hybrid but not hardcore (i believe a hardcore gamer wants immersion even if he plays 15 minutes, a casual games is happy just by been entertained even if that means playing 4 hours i a row).