Mojang will never look at minecraftforum.net. It's a waste of time to write your ideas, but it's not my choice. Mojang has much better things to do than look at suggestions. I am pointless, so you may not need to listen to me.
This forum is very useful for getting feedback on your suggestions before you post them on Reddit, where Mojang does look. Mojang does indeed look at suggestions, and they in fact do it quite a bit.
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Introducing a new series of suggestions, Minecraft 2! Part 5 is (finally) here!