One thing that seems to be happening now is adventure games, being so easy, are starting to attract a new audience - people that mostly play casual games
And for many of these people, the current level of difficulty is exactly what they want... which may pose the danger that developers will start aiming at this group instead and keep making the games ridiculously easy
I hope my little 'conspiracy theory' here is just me taking things too far, it would be horrible should that happen.