At $8K savings per server, that is 8M if you have 1000 server at Cloudflare. Of course you have to invest a lot of people into software and testing as well. As well as many other time consuming things that were likely standard on Intel Platform. Still, those wont cost anywhere close to 8M.
To be honest I am very much surprised at how cheap Qualcomm are selling their chip.
This is going to be the start of avalanche. Once the software improves and make a self sustainable ecosystem, everything else will come. I still dont believe Qualcomm could achieve their 5% Server target by 2020 goal. But it is still a good start in longer terms success.
What is more worrying is Intel's growth and Cash Cow is now at risk in the mid term. It will be interesting to see how Intel react to this. There is serious price pressure from AMD EPYC and Qualcomm Centriq. Intel DC 2018 may ship lower unit YoY and lower revenue / unit YoY. PC market is being attacked by AMD, while not at risk, Intel is definitely earning less as they increase core count.
Personally I would have liked to see POWER9 or RISC-V in server space, but both still missing in action.