Yeah, I wouldn't call a 70% market share dominant at all...
The very statement of mine that you quoted used the word "dominant", silly person. Just not "as dominant" as some people seem to think. It's far less dominant, for example, than MS's share of the desktop OS market.
Be sure to PM me when someone else takes over Google's spot.
Didn't say it would happen tomorrow. But within five years? Very likely. As you mention, there is never finality, and in consumer tech and media this is more true than most industries.
The market has never "spoken" in finality in any industry; the market always changes its mind. Just like how we could find Google in a #2 spot in the coming years, we might find Gmail in the #1 spot as well.
That is very true, but until the services themselves change, overall trends like "GMail's growth is slowing while Yahoo's is speeding" tend to stay somewhat stable.
Consumers are not stoic; they will abandon products they don't like, especially when it's as easy as choosing a new search engine.
This is where you oversimplify to the point of corrupting your assertion. Consumers can in fact be very slow to abandon products when outside forces are at work; for example, Google search being built into browsers.
And I'm not sure where the patronizing "what your friends say" comes into this, but I think I'll defer to other authorities in market predictions as opposed to a random forum member.
Then you haven't actually looked at analysis of the markets in question. For example, my statements about GMail's share are consistent across many published reports. Since you apparently keep up with such things... you should be able to find them.
Let's also not forget how often (much more than half the time) these "authorities" are in their predictions. Current analysis, great. Predictions? Every study demonstrates that throwing darts is more accurate. Every. Last. One.
This is entirely possible. However, given Google's willingness to branch out into other markets, I think it will take longer for Google to become stale and stagnant.
The fact that good talent goes to work for Google is indicative of a company that can still attract the best and the brightest, and hopefully stave off creative ruts.
Doubtful. They haven't introduced anything new that is taking the world by storm in years. Their biggest growth move in recent memory was acquiring YouTube, it wasn't anything internal. Google Apps for small businesses may be their next one that actually captures a sizable following, but... that moves them away from the consumer ad market, where there are mountains of money to be made (albeit with fierce competition), to services which afford much less revenue.