Maybe the latest news from Frandroid will give you hope. They are reporting HTC will update the Tattoo to Android 2.1, which is one of the cheaptest Android phones. The Tattoo actually has more storage and memory than the G1, but this is still a positive sign that HTC is working to upgrade the firmware of as many Android phones as possible.
Here is the badly translated message Frandroid received from HTC:
“Kindly note we understand that now that a phone running Android OS 2.1 is available that you are excited to get an update for your Tattoo. We are still working hard to building Sense for this new version but we expect to have the upgrade finished and ready to go soon. Please understand that it takes time to customize any Android version to ensure you have the intuitive experience Sense provides, and we hope you can be patient for just a little while longer.”