1) Don't build your own, unless you want to waste huge bathtubs of cash on failed efforts.
2) It's not a question of 'if' but 'when' ... you have no choice over this.
4) It won't save you money, you'll just do more stuff (see Jevons Paradox)
6) People will have inertia to the change due to past success i.e. keep a careful eye on your IaaS / DevOps crowd.