Nobody credible is saying that Nokia is going away; they're too big, have many patents, and are involved in other businesses (Nokia-Siemens) to completely disappear.
What many ARE saying is that Nokia is no longer a growth company; they're now essentially a utility, and nobody that wants to make a profit in the markets, outside of your grandparent's pension fund, likes investing in utilities.
One of the reasons for the turmoil now in the company's executive suites and on the ground, is due to rapidly shrinking margins, that are collapsing, partly due to competition from the likes of Samsung and RIM. They're fighting it out with other manufacturers in low and mid tier markets and it's hell on their margins. Comparatively, Apple makes around $500-$600 per phone sale, while Nokia sees $80 per phone.
Many Nokia followers insist that the company doesn't need, and can ignore, the U.S. market. I propose that they really, really do need to be able to crack open the American market; if they find a way to play again in the Super Phone arena, their margins will expand, they'll have their 'halo' device, and they can start, with their good PR department, optimizing mindshare. In addition, most of the latest software innovation is happening in the U.S.
In order to compete in the U.S. though, Nokia needs to fast-track Meego and/or Symbian 4, and they need to reconfigure Ovi services, or at least partition a portion of them, to cater to the American market. Right now, understandably, services including the Ovi store, and even Maps are primarily Euro/Asia-centric. They'll also need to do something about their customer service and post sales support in the U.S., possibly partner with a company with a large bricks and mortar presence (Wal-Mart/Target/Best Buy/Radio Shack).
Anyway, that's my $ 0.02.