Actually, I think the Kindle Fire is going to do the opposite - it will give Android developers a specific SKU to develop or tailor their apps/games for. In fact, I think a lot of them will become 'Amazon Tablet Developers' instead of 'Android Developers'.
At that price, it's not exactly a stretch to say the Kindle Fire is will sell as fast as Amazon can make them, leading to a huge install base. With that I think you'll see a lot of developers taking full advantage of the benefits of known quantities (exactly what makes the iPad so popular, and the apps so 'smooth'). Knowing exactly what screen size/resolution, CPU speed, memory etc they're coding for makes a huge difference.
The Kindle Fire is the best thing to happen for Android in a long time, and the irony is, Google has no control over the product whatsoever.
The Verge has a great article on it.
The only thing holding it back is that it's a modified version of Android 2.x instead of 3.0+ which has true tablet widgets for developers to work with. Amazon needs to update the Kindle Fire to support ICS ASAP so developers don't have to specifically target the Kindle Fire.