Well, I see no real harm in this.
For Zelda, this means either, that 1:1 will be too advanced, and that there won't be any. They instead focus on making an easy control method, ala TP (but maybe a bit more responsive).
Or, it could mean they are making 1:1, as swinging the remote as a sword is easy as heck to pick up.
Oh, and for you own first line Shameless, yes I believe Nintendo are stopping(actually has stopped) to make games specifically aimed at the hardcore.
SMG was not directed solely at the hardcore. It was easy to pick up and play. Sure, finishing the game was hard, but with as long time as casuals use, they would get the same playtime of doing what they are able to.
SSBB is far easier to play than Melee was, and the SSE 2nd player is clearly directed at having a little brother/sister play.
Mario Kart Wii is really easy to play. The items also make people who are really bad sometimes get a decent place.
Metroid Prime 3 had a far more casual friendly control scheme, and the Normal was a lot easier than on the earlier games.
Twilight Princess had far easier boss fights, which made the game signifficantly easier.
Having said that, this by no means say that they aren't core friendly.
SMG has 30 stars that are fairly hard to get, and 10 very hard. The latter ones will be a challenge to all players. The 30 ones will also be hard enough to produce a lot of fun to almost all hardcore, and most core gamers should think the last 100 are awesome.
SSBB has even bigger depth than Melee, and SSE is a real challenge on the higher difficulties. The online addition also adds great competition possibilites.
MKWii has flawless online, and the 12 player race makes you stay even more tuned, as anyone can get a good item and go slight in front of you. Now, you can never rest.
Metroid Prime 3 has just the same difficulity as nr 1 if you play on veteran, so there shouldn't be any problems there.
Twilight Princess has lots of ways of making the game harder, and if you don't take them, it's your own fault that the game is too easy.