Funny all those predictions are wrong.
Apple's time is coming, it is a matter of time before they overtake Microsoft.
They have done it to Dell.
Regarding the first line: "Hello pot? Yeah, hi, this is kettle. You're black."
Anyhow, my prediction is that Apple will continue to be a small, almost insignificant company-as far as computers are concerned-for the foreseeable future (say, through 2009 or 2010). Check out their market share:
http://marketshare.hitslink.com/report.aspx?qprid=5
According to those figures, it's grown less than 1.2% in almost a year. That's a statistically insignificant amount, I think. As long as Apple continues to build computers that appeal to a very narrow user base (due to things like relatively long product cycles with few if any intermediate updates, products that place form over function to the point where form interferes with good engineering practice in some systems, the perception-accurate or not-that the machines are overpriced, and the perception-again, accurate or not-that there is no software out there for them and the perception that they're difficult to integrate with networks/multiple computer households where other machines are Windows-based), they will remain-as I've said-a small, basically unimportant company, at least as far as computers are concerned.
That being said, I will grant you that there is always the possibility that they can expand their peripherals (iPhone, iPod, iTV, etc.) business and grow in that area. But the computer division isn't growing rapidly at all, according to all the numbers I've seen.
//EDIT: And they have NOT overtaken Dell in sales (and I'm not sure they have in other objectively quantifiable standard that you care to name, either). Post some numbers to back that up, please. I'd love to see them.