Yep.... I have a 128GB Air 2 with T-Mobile cellular and I have no plans on upgrading it any time soon. I've upgraded iPads pretty regularly, ever since the original model was new. But at this point, I feel like the product has reached "maturity". It has enough RAM memory, battery life and enough processor speed, plus is as thin as it needs to be. Basically, I use it like many people -- for media consumption. (Everything from reading email to web browsing to reading online newspaper subscriptions during my commute on the train.) There's not much I would get out of another upgrade right now. (Better speakers? Who cares? I only listen to music from it via bluetooth -- so the money would be better spent on a higher-end bluetooth headset.)
I think that this question gets to the heart of why iPad sales are generally not setting the world on fire. An old iPad is still a great product! I get every new model of iPhone but I skip a generation or two of iPads. I still have an original iPad mini that is great for what I use it for. I will plan on staying with iPad Air 2.