The sysadmin you need to manage your cloud infrastructure isn't going to be any cheaper, and if you want high-reliability 24/7, you still need your own staff on call 24/7, so you still need multiple sysadmins.

If some cloud setup can halve your sysadmin labor, then a company with 20 sysadmins can go to 10 sysadmins, but a company with 1, 2 or 3 sysadmins still needs all of them.