ARM processors still have a tremendous chance to succeed in servers given Microsoft's and Qualcomm's pursuit of this goal.
Microsoft plans to make over 50% of its data center servers run on ARM CPU's.
https://
www.theregister.co.uk/2017/03/09/microsoft_arm_server_followup/
Furthermore at least two other major data centers are planning to use ARM-based servers.
http://semiaccurate.com/2017/03/13/second-megadatacenter-goes-heavily-arm-cpus/
http://semiaccurate.com/2017/03/14/third-huge-datacenter-falls-arm-servers/