Warren Buffett wouldn't even invest with his friend Bill Gates. He said he didn't understand tech then and he's said the same thing more recently as applied to Bitcoin. He chooses only companies with balance sheets he understands, such as those selling razor blades, candy bars, or space on railroad freight cars.
I've never understood why, when someone is an expert on one thing, people expect that person's wisdom to extend into other areas. Asking Warren Buffett about Bitcoin would be like asking Bill Clinton about Hollywood celebrities and how they should act. He's famous and he was a popular president, but the fact that he's a celebrity doesn't suddenly make him an expert in Hollywood life. Just like Warren Buffett doesn't know jack s*** about Bitcoin or any other technology investment.
Here are a few "words they may have to eat" nominations. These are paraphrased, not exact quotes.
1. "Mortgage markets are a powerful stabilizing force." --Alan Greenspan. It has some truth, but in hindsight it wasn't the best thing to say.
2. "Mt. Gox is the Ft. Knox of Bitcoin." --Anonymous user of Magic The Gathering Online Exchange.
3. "Franko is freedom." Reality: One of the first altcoins, currently with a market cap of $37,000 and stuck around #112 amongst altcoins.
4. "The 10-inch screen size is the minimum size required to create great tablet apps." --Steve Jobs (RIP)
5. "Way overvalued for a search engine." --Me, dismissing a chance to get in on Google near the beginning