* What kind of industry does Iceland have that requires 'physicists, programmers and engineers'?
The same kind of industry that requires physicists, programmers, and engineers anywhere else: R&D, software engineering, tech sector in general. (See next answer.)
* With a population in the hundreds of thousands, smaller than even medium sized cities in most countries, how much opportunity is/was there for these people?
The population size doesn't define the size of the economy - the natural resources and infrastructure do. Iceland is a pretty large island that controls a huge swath of ocean around it that has valuable fisheries in it. Plus there's geothermal energy etc. etc., so the country is very rich.
* It's not even big enough to sustain a serious university, let alone a real r&d environment.
That's simply not true. Iceland has pretty significant research output in biology, genetics, computer science, geothermal and hydropower engineering, etc. etc.
* Using Iceland as an example for other countries is usually fallacious, because it's so unique.
:) That's certainly true. In a way. But people are people, nations are nations, good ideas are good ideas, and pitfalls are pitfalls.
Eve Online. No, really. It's Iceland's third-largest export. (See e.g. http://www.eurogamer.net/articles/2011-04-04-eve-online-real...)
And Eve is more than just a bunch of hackers - heck, they employ a lead economist. (http://www.scientificamerican.com/article.cfm?id=virtual-wor...)
I'm an Australian. There's bugger all opportunities here, because there's no VC. There's no VC, because the domestic market is too small, and the nearest international trade partner worth speaking of is on the other side of the Pacific Ocean. Oh wait, there's also Japan, and now China and India, but they are kind of emerging, and there's cultural differences. (Note the sarcasm).
VC won't come to smaller markets until startups start proving that they can operate in a globalized environment, and they won't do that by sulking, hoping the government will give them all cushy subsidized finance jobs.
In fact most people most probably wont go to SV.
This tells us, of course, that bankers didn't add (enough marginal) value. Which was probably true, given that they defaulted. Iceland profits from not calling with a shitty hand (i.e. bailing out stupid banks). No "bankers are evil" morality needed.