Only 10,000 users and 1,000 courses? What about us with +100,000 users or should we be knowing what we are doing with environments that size ? 
I love the concept of this. Additional options to factor other thing would be good but there would be no way to meet everyone's Moodle set up/usage. I am curious when your tool decides to make multiple web servers, a separate cache server, and/or database server. If the user needs to have a high availability environment then the system will always have at least two of each server type. I would think you would want to keep a single web server until you hit that server size limit as you have to go from local disk speeds to network shares for Moodledata. There are hundreds of other factors but the transition of using local disk to shared storage is probably the number one thing that would bottleneck in Moodle.
I love the concept of this. Additional options to factor other thing would be good but there would be no way to meet everyone's Moodle set up/usage. I am curious when your tool decides to make multiple web servers, a separate cache server, and/or database server. If the user needs to have a high availability environment then the system will always have at least two of each server type. I would think you would want to keep a single web server until you hit that server size limit as you have to go from local disk speeds to network shares for Moodledata. There are hundreds of other factors but the transition of using local disk to shared storage is probably the number one thing that would bottleneck in Moodle.