Google can keep pushing out updates but the percentage of devices on any particular version will keep getting smaller. The whole thing is fundamentally flawed.
Why? They're the ones that wouldn't agree to the terms that would have prevented an unnecessary bottleneck.
Phones don't need it either.
I love open-source, and I'm a huge believer in the possibilities it represents. But I think those beliefs blinded people in the beginning, who assumed that carriers and manufacturers would similarly care. They don't. Hell, they're even slow to respond with security updates. Google is moving in a better direction, but it'll take a while. If we're really lucky, carriers and manufacturers won't notice the gradual changes and raise a fuss.
You'd think that, as long as they get to customize things to their heart's content and install their bloatware at some point, they'd be able to realize the benefits of a better update model. But then again, major UI changes that are clearly visible help differentiate new devices. So there's a nasty vested interest at work there as well.
From my recall, Apple actually has a "Verizon team" that works on ensuring iOS updates meet all of Verizon's certification requirements for release ahead of announcement, which is why Apple software updates never suffer that terrible additional wait Android updates have before they end up on Verizon phones.
If Google deserves criticism it's for not pushing harder and more consistently on initiatives like Google Play Edition and Android One.
There's too much conflict of interest to trust cell companies to finance your phone.
In a strange way, this article confuses latency with throughput. It takes a long time for each Android update to gain a majority of the installed base. But it does get there. Slowing the frequency of updates will not change that.
Android continues to develop at a fast pace. Android N previews large-tablet/desktop OS features like proper mouse support and resizeable windows. This would not be the time to slow the release schedule.
One reason I hope the tablet market grows to where it can influence the overall Android market is that tablets do not need carrier approval for updates.