I like this idea if it was implemented well.

One thing that bugs me about FFXIV is the lack of danger in the open world, so I can definitely get on board with this. The problem lies with how SE would choose to implement it; if something like this isn't fully thought through it would only become annoying and frustrating.

A suggestion I heard before would be to simply add mobs in the open world that are above level 60 (beyond our cap). This would make the world dangerous and you would actually have to think before charging into things, such as gatherers using stealth or bringing potions with you. I imagine a lot of players complaining about this though, which only links back to the title.. maybe the majority of FFXIV is afraid of challenge.