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Two somewhat opposed influences that come to mind are rising security concerns after recent high profile breaches and increased acceptance by a wide segment of society. The first has been an issue since the advent of cloud computing, and security will continue to be a concern for the foreseeable future, which is probably a good thing. The second influence is very ground up - people have largely become accustomed to having their information and data stored in the cloud. Everything from having photo automatically backed up to cloud game saves are a part of the day to day lives of hundreds of millions of people. The cloud isn’t some scary unknown anymore, it just is.
On a more journalistic front there was a recent zdnet article talking about the four major security trends impacting the cloud:
Shifting motivations behind hacking
Consumerization of IT
Evolving architecture technologies
Challenging regulatory environment.