Yes, agree on all fronts. At any given time in the startup world, there are "hot" markets as perceived by entrepreneurs and VCs that look like they'll be huge

Yes, agree on all fronts. At any given time in the startup world, there are "hot" markets as perceived by entrepreneurs and VCs that look like they'll be huge that won't be. And there are markets that don't look "hot" at all that will ultimately be huge. Search keyword advertising was like this -- when Overture first came out, most people (including me) thought they were nuts. Sometimes you get the "hot" market that turns out to be huge. That's a nice situation. Then there's the fourth category -- un-hot markets that turn out to be tiny. There are a LOT of those :-).