But they have better power-consumption than the former, and better performance than the latter. Which is not a bad place to be, IMHO.
For a product you are right, but for a company? Not at all. As IDC correctly pointed out there isn't such thing as niche semicon company.
It may work for a generation or two but after that you simply cannot match the money your rivals are going to put on R&D and then your product is hopelessly outdated.
R&D costs for each new generations will go up but your revenues and/or margins will be under pressure because of your competitors. There will be a point in the future that you will either make a mistake or you simply won't be able to muster enough resources to develop a new architecture. The moment this happens, you are done for.
This is more or less what happened with AMD since ATI acquisition. The moment AMD shelled out cash for ATI AMD signed its death writ. After that AMD simply didn't have the financial resources to upgrade fabs in the same pace of Intel and neither keep pace with the engineering improvements coming from Santa Clara. Instead they had to resort to milking the Phenom architecture for years and going lower and lower in the price ladder. They were cramped in a smaller market bracket and margins got under pressure by competition with Intel.
Then, they made the mistake, Bulldozer, and we all know what is happening with AMD market share wherever we look at them. But even if Bulldozer didn't backfire, or at least if they had come with something more along Phenom lines, they would simply fare a little better than with Bulldozer, but the fundamentals, that AMD simply could not match Intel schedule and qualitative improvements, wouldn't be changed.
By betting the farm in Jaguar, they are simply entrenching themselves in a niche that is too small to sustain the company in the long term. AMD stock is getting pounded because the market sees AMD having less cash flows and competing in a market with even worse margins than those they are in now. And more important, market cannot see AMD viability in the medium term.