I doubt they will implement any option that lowers the number of people queueing for DF. Managing queue times is one of the biggest challenges for most companies like this, so they want to funnel as many people as possible into that thing.
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I don't think that players be afraid of challenge. The problem is rather that the challenge exists until it is defeated. After, the repetition transforms the challenge as a constraint. And it is not fun anymore.
I am always supporting suggestions asking for more challenge but I can't see this happening.
This really isn't what Yoshida aims for.
I like your idea and hope that you decide to come up with more suggestions for challenge. ^^
Unfortunately, the DF exists because, without it, people simply wouldn't play. Even WoW had to embrace a more casual centric market to accommodate the average gamer. Gaming has become far more mainstream than ever before, and that brings a multitude of different types of players. This all said, I do think FFXIV swings too far in the opposite direction with how absurdly easy some content gets.
I'm not saying instanced content has no place but we are a bit top heavy on it by now.