HTC :: Hero CDMA: No Update To Android 2.2?

I have a CDMA Hero with Cellular South (a regional carrier in MS, AL & FL). They have been generally pretty slow to provide updates and currently have only released Android 2.1 for this device. I was hoping that they would eventually provide a 2.2 update, as I understand that this would allow some applications to be moved to the flash card. Right now, the limitations of being able to store applications on only the phone memory is fairly constraining and makes the decision of whether to install or not install an app pretty tough.

I have been recently told that Cellular South does not intend to update this phone to 2.2, so it will be stuck forever on 2.1 (unless I install a 3rd party update). why this phone would not be updated to 2.2. Has HTC just decided to not support it any longer? If so, I've bought my last HTC phone.