I think, the power of cloud is too big for SCADA to resist any more. Industry 4.0 needs Machine learning and AI. SIEMENS, Rockwell, Schneider and other automation product manufacturers need cloud because the traditional automation business is heading towards stagnation. Cheaper PLCs, RTUs, SCADA and cheaper manpower from third world countries are flooding the market. Every one is fighting for a share of the same pie. Supply exceeds demand. Google, Facebook and Twitter are rewriting the destiny of automation business.
I know one automation company, managing more than 25 airports from their remote office in Europe. They don’t have a single PLC/SCADA programmer on site. They have a 24x7 support team in Europe, developing, uploading, updating and maintaining their PLCs and SCADA stations remotely via VPN. They can watch the plant remotely from cameras. They have less than 5, all rounder “3 in 1” technicians (Electrical+Mechanical+Instrumentation) on site per 12 hours shift, who don’t have any job most of the times because the system uptime is 99.9% to 100% daily. They have even a maintenance wiki on cloud with plant drawings and possible best solutions with a video library for almost every failure.
All systems have redundancy and they have official “predictive maintenance” schedule. I have seen their technicians replacing even properly working sensors, motors and other critical spare parts, sending it for service because they have completed their run hours. The airport manager proudly says “Before we use to have around 60 people working. With this new system, we have only 15 people working. We got our ROI in less than 18 months and we are very happy”.