
I don't really mind that indie games constantly focus on Retro, because it saves them money and means my computer can handle it (I played Street Fighter X Megaman today in fact), but while I haven't actually played any of the ones you mentioned, there are enough IWannaBeTheGuy Let's Plays to last a life time, and it doesn't seem to add anything except "hey, remember when NES games were really fucking cheap? Rather than evolving with the times, we're just going to be really cheap too, and say it's a 'retro challenge.'" At least, that's what it looks like to me.
Case in point: what you talk about in the article hasn't affected me directly, but I see your point from my vantage point, which is located at a distant point from the retro gaming oversaturation experience point.