How far will ARM get in the DataCenter?

@DanielAtHP posted and @unixplayer re-tweeted this blog post regarding ARM in the Datacenter.

The argument is basically ‘ARM isn’t tuned for servers now, so it will fail in the future.’

I think this ignores several interesting realities:

1. Web Servers (and the whole LAMP stack) can run TODAY on ARM servers.
2. You can purchase ARM blade servers with INSANE density today.
3. The article says “The ARM architecture works best by when workloads can be efficiently divided into many  small pieces”. That’s where a TON of CompSci research is focused on these days. Witness the rise of Erlang, Scala, etc.
4. How many web apps and ‘Cloud’ service environments would love ARM?

All that said, in the next 5 years, I see ARM making a dent in the server space, but not taking it over.