You've got several things wrong..
1. Don't use any official Android distributions (operate as a niche/self-supported market, ie. Amazon)
2. Use any combination of Android and forked android-derived distributions, but can't join the OHA
3. Join the OHA and use only an official Google Android derived OS
That's completely wrong.
You have several choices:
1) Develop an Android compatible device, compatible with existing Android applications, and don't pay a cent to Google or anyone else for Android.
Sell your devices with getjar app store, Amazon app store, Bing as default search, Nokia maps, change the UI, whatever the hell you want as long as you don't break compatibility.
2) Do 1) and also join OHA. Still don't pay a cent to Google, still sell your devices with getjar app store, Amazon app store, Bing as default search, Nokia maps, change the UI, whatever the hell you want as long as you don't break compatibility.
3) Do 1) and 2) and also license Google applications and the Google Play app store.
4) Use the open source Android code (definition of open) and do whatever the hell you want with it like Amazon, modify it, make it incompatible with Google's Store and current Android applications, don't pay anything to Google, don't join the OHA, get the source code for new versions of Android soon after Google announces them, make your own app store.
Acer chose option 3) for their current devices. Google said if they're doing option 4) with Alibaba, they cannot also do option 2) and/or 3). And Acer made their choice, nothing was forced on them. All Google could do was force Acer to leave the OHA and refuse to license Google Play and other Google applications to them. Acer could still make Android compatible devices, even continue to sell their current devices with the Amazon app store for example. They chose to remain part of the OHA.
the OEMs are already way behind in keeping official Android up to date in their design and production pipelines even with that inside track and help from Google. An OEM on its own trying to make an official Android device is thus at a large disadvantage against OEMs that are part of the OHA.
That's simply not true. Some of the first non Google devices to come out with Android 4.0 were from Chinese low end manufacturers who are not part of the OHA, much before the bigger well known OHA members. That was because the OEMs insist on customizing their devices to distinguish them from stock Android. And far from being uncompetitive, those manufacturers have been incredibly successful. Some have gone on to license Google Play and Google Apps. Want to beat Google? Make your own app store and your own apps that are better than Google's proprietary apps like Maps Gmail etc. Amazon are trying. Acer didn't want to take up that challenge. No one forced Acer to do anything. They made a choice.