I am not familiar with Lucian Armasu. He seems to be a Romanian blogger and ARM advocate. I cannot find anything he has authored other than comments on articles. Lucian speaks through ARM colored glasses and has no special source of information.
I think that people have underestimated the power optimization that Intel has incorporated into their chips and especially Haswell. Intel may be guilty of missing the dramatic shift in low power that ARM enabled, but they are not guilty of ignoring it. My source indicates that Paul ordered a Haswell redesign to chop power consumption. We will find out more in 5 weeks at CES2013.
I doubt that there will be a $20 ARM server chip. This has the same problem that the BIG.little has. It takes too much silicon.
I think that many will skip the microserver hardware and implement virtual machine instances on a Xeon server. You can run any OS on a VM which is more flexible and cheaper per user.
There is not any credible argument that indicates that either ARM or Intel will disappear.