"noone's even considered or thought about Itanic in regard to ARM. "
What a silly thing to say.
To add to Jason's entirely reasonable writeup:
ARM is a free market success. Lots of people are buying lots of different flavours of ARM, of their own free will.
IA64 is a total disaster. Intel said it was going to be "industry standard 64bit computing". It wasn't, and isn't. The only significant people buying IA64 are HP, and HP's customers are only buying it because they need something which they can only get with their OS of choice (HP/UX, Tandem NSK, VMS). If their OS of choice was available on other hardware (AMD64 an obvious choice), then that's what they'd buy. Whether or not it's "IA64 Inside" is largely irrelevant to them.
IA64 is a big fat ridiculous white elephant, dying on its feet. ARM isn't.
As Jason said, "ARM still exists after 27 years because it has succeeded in key markets. It's not because of hype."
The folks who know ARM know how good it is at what it does. Until now, ARM has been focused on particular market segments which are not that visible to Joe Public or even the IT industry media, even though Joe Public probably possesses two or three ARM chips already and an IT geek probably has more (there's a tiny tiny tiny chance Joe Public or IT geek will ever have an IA64 of their own).
Courtesy of recent developments in the ARM market, and courtesy of CES last week, and even more strangely courtesy of MS at CES last week, ARM is finally starting to get a lot more coverage, even in the general press. And the cluelessness of the people here who are saying "it'll never compete with x86" is starting to show. As is the cluelessness of Intel HQ.
Looking a little way into the future, what won't you be able to do with next year's follow on to this year's Samsung Galaxy Tab (or whatever) that your x86 will do for you? Other than run x86-specific malware, obviously.
[Not associated with ARM in any way except as a user since 2000 or so]