Does anyone remember that BIS first planned to include the CWC campaign in ArmA? Well, the OFP campaign may have not been released with ArmA, but someone in BIS is keeping the idea alive. Check out this page!
Basically, BIS is planning to start a collaborative project (with the community's help, I suppose) to convert the original campaign and all single player missions into ArmA as an addon. OFP:E data will be used as the basis for the project. Participants will submit material to a central database, and after several stages of conversion and testing, it should be released as an official addon! Assuming the project is successful, it might be followed by Resistance Rearmed. No explanation required.
I guess OFP hasn't kicked the bucket quite yet. Better strap that helmet on and get to work, meat-heads!