No, people will not come to a new conclusion. Hardcore gamers will not turn into a white bunny playing Tetris all day.

There are several people and several tastes. Some love hardcore some love casual. It just depends.

And since the number of casual gamers is growing it is worth to develop for them. Now all the big publishers are doing it and this leads to a point to wonder if indies are not too late?

Even a casual game is professional. Look into the casual web platforms. Graphics are fantastic, music is great and gameplay is often very good with much gameplay elements, effects and well-thought timing for levels or incentives.

You cannot easily compete as a one-man-army against them. Yes, you can sell an over-night project or A7titude, but it is still another league than the games offered at Steam.
We can take Ichiro as an example. He worked very long and very hard to come to this point. And he did not do everything alone. Even the idea is a derivate of a japanese project. But I consider him very professional though he still is indie.