I had a cow-erker who played Evercrack, and then City of Heroes. Where I balked at paying $15/month for a game I probably wouldn't play every month, he found that he saved money. He and his friends used to go out and eat every weekend. Then they switched to playing MMO's together on the weekends. They stayed in more, and spent much less money overall, making the $15/month a good expense.
As for comparing RIM to Nortel, that might be a bit off. Nortell was strip mined by chinese hackers for intellectual property and that technology later manufactured in china and sold in the US. The result being, nobody bought Nortell, they bought the knock-off stuff. NPR did an article on it.
RIM's case is more like what I saw in the long time I spent in a fortune 20-something company. Each quarter produces big numbers in sales (billions of dollars). But that's not what is compared to. Instead, it's growth quarter over quarter (and vs. last year). For a starting company, this might be OK, as you've only reached a fraction of your potential market.
But a mega-corporation HAS already reached everybody who might buy the product. I guarantee you have heard of the company I worked for, AND you can name our competitors. That's how big we were, and we were in number 1 or number 2 position for each technology we produced.
How can you expect to sell more iGadgets next quarter than this last quarter, when everybody who was going to buy an iGadget already owns one? Obviously, there's some product-turnover as folks upgrade their old stuff.
But you can't grow like gang-busters when everybody owns what you sell or your competitors' product. Once bought, until it needs an upgrade or fails, you aren't buying another one. So once you buy the competitor's, you're probably off the radar of potential sale for a while.
Yet this unrealistic expectation of growth in large entities, which is less likely than small entities (children grow much more than adults, who at best, get bigger ears and noses, barring weight disfunction issues).
That's some of what RIM is experiencing. Their numbers aren't increasing as much as before.
However, in RIM's case, there is also the issue that many business folks are replacing their BB for an iPhone or Android. We were a BB shop. Now we hand out Iphones and Androids. BB is dead to us.