Well, I am not one of those professional keynote speakers that have as a main objective to convince the audience that they are the only expert that matters; I am merely one of those guys that have, for the most part, to make their way through the terms and conditions of service agreements or hard- and software vendor contracts to keep "their" enterprise datacenter running.
And here it is: internal business partners, often referred to as "stakeholders" (whatever that may signify, precisely), ask for more flexible resource allocation - such an "on demand" thing would be nice that you seem to get so easily virtually everywhere. Okay, did it. Here's what I found: current operate lease contracts (that's what is sold as "on demand" in most cases) are unflexible, full stop.
While the customer wants something "cloudish" (like "Storage on Demand" with monthly per-use invoicing and geo-diversity and all that spiffy stuff), the vendors find it obviously hard to hide the complex "leasing" core of their contracts with its co-termination aspect and the "service" piece that they'd like to add for profitability.
So I saw a couple of cases where "on Demand" actually turned into "eventually you can only grow, but that you can do as you like; as to the cost, sorry, but we have to add an allowance for our field technicians; oh and BTW we have to triple the paperwork to make this great thing happen."
Finally you as a customer end up thinking that you could ease your life and do leasing or just purchase the boxes as your grandfathers did.
So beam us up to the cloud - there is no intelligent "on demand" down here.