Valid concerns indeed, but I don't get the desire to install Android on these. It feels kind of like buying a MacBook Pro to install Windows on... if MacBook Pros were built like mid-range Inspirons.
If Apple had just announced they were going to stop making computers and were discounting the rest of their stock by 80%, you'd see a lot of people buying them to install Windows on.
There's always the Pre/WebOS internals hacking team. The homebrew communities that build up around these types of products have always been extremely helpful.
They already said they would continue to support current devices and continue to work on webOS.
Why would they continue to do any of that? There is no money to be made. They couldn't even bother to continue to sell the devices for more than 48 days.