It's possible, but just like the x86-64 transition it won't be pretty.

protomyth · on Oct 21, 2010

It might go better for ARM given that most of the more tightly controlled software that is delivered on ARMs (app store or custom embedded).

mfukar · on Oct 22, 2010

I'm curious; have you faced any problems in that transition?

(seriously, I'm not trying to troll. I've had exactly one - making sure a project of mine would compile as PIC and that was pretty minor after the required reading)

ryanpetrich · on Oct 22, 2010

There haven't been any major issues, it's just been glacially slow. Most software running on capable CPUs is still 32 bit, Visual Studio still doesn't have first class support for 64 bit and my MacBook still runs a 32 bit kernel.

I expect ARM's transition to be quite different though--with the highest ends of their business moving in only a couple product cycles, and the lower ends of their business sticking with 32 bit indefinitely.