Most of the changes you describe enhance the user experience. Do you honestly prefer to wade through a few dozen promotional emails to find messages from your boss, friends or family? Is your argument seriously that google should make their products more inconvenient so companies have to spend less money on adwords? Not to mention the idea that there's some kind of zero-sum trade off between email marketing and adwords is ludicrous.
Similarly, wikipedia ranks high for keywords when they are associated with queries for information, not product offers. Your example of the keyword "computer" is a terrible example for making your point: for me at least, only two ads show up for this keyword, but there are dozens for "laptop". This is a strong indicator that "computer" by itself is not what people google when they're buying computers. By contrast, type in "new computer".
Finally, the keyword tool has required a (free) google ads account for a long time, so I really don't know what you're going on about here.