One reason enterprises might eventually rethink why, where and how they use public cloud--including access service providers--are the normal economies of scale that apply to enterprise computing at scale. In almost every case, small volume tends to support the economics of a cloud approach that comes with leased access to compute cycles.
But in almost every case, very-high volume tends to shift economics back to ownership. In other words, pay-per-use is affordable at low use volumes but increasingly expensive as volume grows. At some point, as the number of instances, licenses, subscriptions or other usage metrics grow very large, ownership starts to offer lower cost.
The key, though, is whether the “owned” capabilities are functionally similar to the leased facilities. And that might be the key insight about access service providers using public cloud for their computing infrastructure. The advantages of using public cloud might, in fact, not be scale advantages at all, but the ability to take advantage of the most-advanced and up-to-date computing architectures.
Flexibility and agility or skills availability might be cited as advantages for using a public cloud, but those same advantages might be attributed to sufficiently-large private clouds as well. The issue there is “might be.” If there are advantages to scale for cloud computing, then perhaps private cloud as built by an enterprise. never can approach the scale advantages of a public cloud supplier.
But again, scale advantages might not be the main issue. Even when reliance on public cloud costs more than an equivalent private cloud, the perceived upside of using public cloud might lie in its expected advantage for creating new applications and use cases at scale.
In other words, customers might trade higher cost for higher agility. Those with long memories will recall the operational problems caused by many decades of accumulated proprietary telco operations support systems, for example.
The shift to reliance on public clouds for OSS type functions is a move to eliminate the downside of proprietary approaches and legacy solutions.