Ah, so you own an iPad Air 1. In your previous comment you neglected to provide that tidbit.
Yes, Apple has done things (more recently than in the past) to give customers reason to pause before considering buying/upgrading.
I bought an iPad 1 when it first came out. Upgraded to a 2. Skipped the 3 (because it was pretty obvious it was going to be short-lived), picked up a 4 with the expectation of keeping it for 3-4 years. The performance degradation of the 4 as a result of iOS 7 and 8 caused me conclude that the 4 will be my last iPad until Apple demonstrates a willingness to preserve customers' investments.
I sat out the Air and Air 2. I will be testing iOS 9 on my iPad 2 and 4 to see how well it performs on those devices. By then, I'll see what the landscape looks like.
As far as protecting my investments in technology, I have found that my Android tablets are still going strong and are still performing as well (if not better due to rooting and debloating). Some make a big deal about "missing out" on newer versions of Android, but having a downlevel version of Android hasn't prevented me from using the apps that I need/want. I suppose that is where fragmentation is a benefit... developers need to support more than the latest version of Android to widen the number of potential customers.