You can't. Every business over a certain size will still need in house people that understand their problems. All Amazon, or any cloud providers for that matter, are doing is abstracting away IT services from the bottom up.
Need a server? click a button
Message queue? click.
Database? click.
Virtualised Desktops? clicky-clicky.
Virtual Tape Drive? (I'm as surprised as you are).
You're still going to need people who need to know what each one of those things means to your business. But in-house enterprise IT today still consists of lots of people (and payroll) who put things in racks, re-image desktops, restore SQL Backups, install custom software and give the tapes to the dude in the motorcycle helmet...
In the medium term the cloud won't replace IT. It will however redefine it to the point that the 'spare capacity' that you mentioned will be seen like an amusing anachronism.
Need a server? click a button Message queue? click. Database? click. Virtualised Desktops? clicky-clicky. Virtual Tape Drive? (I'm as surprised as you are).
You're still going to need people who need to know what each one of those things means to your business. But in-house enterprise IT today still consists of lots of people (and payroll) who put things in racks, re-image desktops, restore SQL Backups, install custom software and give the tapes to the dude in the motorcycle helmet...
In the medium term the cloud won't replace IT. It will however redefine it to the point that the 'spare capacity' that you mentioned will be seen like an amusing anachronism.