Perlin Noise is a cheap way to get repeatable and smooth randomness but should just be one tool in a world generation toolbox. I think most infinite worlds quite quickly collapse in 'interestingness' because after travelling for a short while in any direction you quickly see that there is nothing new out there.

So, instead of creating infinite worlds I'd like to see a lot more focus on procedurally-generating very interesting finite worlds. For games with a simple 2d tile-based grid, we then don't have to limit ourselves to just crafting noise-based functions -- as we can create the entire world at once. Games like Dwarf Fortress, Spelunky, Nethack, Terraria, etc., all follow this approach, and I'm trying to do the same in my own game, Moonman. So get our your IDEs and start creating house, face, forest, creature, item, and cloud generators. :)