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Also, it would be much fairer towards developing countries, e.g. in Africa, if we would truly open ourselves to real free-trade instead of building tariff-barriers to keep those countries from selling their produce to us. That could enable many poor farmers in developing countries to build better lives for themselves. It is inherently unfair the way that we are shutting these farmers out of our markets, and insisting that they need to open up for us to sell our products to them.
In addition to that, the world would be better off if we were to concentrate on areas where we are able to compete, and let countries with suitable climates concentrate on agriculture. That is what is called comparative advantage - we should all do what we do or can do best, and then trade fairly with one another. That will lead to products of better quality, made faster, and in greater amounts.
But - and this is a very weighty but - there are two other factors in the equation. Firstly, there is a food shortage coming. With growing populations, some have estimated that global food production needs to be doubled or tripled in the next 40-50 years. That taken into account, it might not be so desirable to pull the plug on the Norwegian agriculture and let it die. Maybe, in the long run, it would be wise to keep it alive for a while.
The other thing is that if the global warming continues, which in all probability it will, this would lead to the Norwegian climate becoming more suitable for farming than it is now. And thus, in a few years, the Norwegian farming might become a lot more competitive than what is now the case.
I guess the bottom line is that, as with many other issues, this is a difficult one, and it's not easy to say what's the right thing to do. As one of the richest countries in the world, such mercantilistic policies are in any case simply unethical. And the subsidies and tariff-barriers need to be lowered, even though that means that some farmers will be forced out of business. Farms being shut down is not an irreversible process. When or if the Norwegian climate will become more favorable, agriculture will inevitably grow even though it temporarily shrinks.