It's a bit silly to even think about the idea of making the Macbook waterproof, but I do see some uses. In my opinion it would be as silly as waterproofing an iPhone. Why? Simple, the iPhone would be waterproofed for I think 4 use cases. Accidentally spilling liquid on it, using it outside in the rain, making underwater photos and maybe using it in the shower/bathtub to read the news while you relax or something.
3 of these use cases could also be applied to the Macbook. Since the Macbook is also very mobile I can see a lot of people using it outside in the work field with the possibility of water spatting on the Macbook. Accidental spillage of liquids is also a very reasonable assumption and using the Macbook in a bathtub could also be a use case for some.
The thing is: there are many people that have many different use cases for the Macbook. Use cases you simply can't imagine because everyone uses their products in different ways. As for Apple incorporating this waterproof feature in the Macbook, I think the chance is very slim, but one can hope/speculate about it.
Boltjames, please be kind and either refrain yourself from posting or stop trolling.