Despite what Government thinks of Google, I think holding antitrust hearings is just a political theatre. At the end of the day they might slap Google with a penalty which by all accounts will be just a margin of error tax write off. If the government really wants to encourage competition, they need to enable creation of new businesses, plain and simple.
Google isn't a Monopoly as much as they just have the most eyeballs because they built a great company. But Facebook, Pinterest, Snapchat, Reddit, and a few dozen smaller players, are all the answer to Google's monopoly.
I've just spent a few days testing different ad segments, and for the one I was doing, it turns out Reddit was 5x cheaper than the next cheapest source. Cool right?
What we need is more companies that are able to capture eyeballs, and an efficient mechanism to distribute ads among them.