Rob, I have two points here: Betamax and OLPC.
The primary lesson from Betamax is that usually one format wins. So pick your poison now. Do you want to:
A) Support a spec that is truly open and supported by other programs?
B) Support DocXML, which you don't have any no hope of ever influencing and is under the control of a corporation hostile to you?
C)There is no option C. This is a two pony race, and sadly W is right here: "You are either with us or against us". Your lack of explicit support for OpenDoc is basically implicit support for DocXML.
The kids I am primarily speaking about are the ones receiving their laptop through One Laptop Per Child (OLPC).
If Abiword is serious about trying to be their word processor, your current attitude towards OpenDoc is not going to get you there, in my mind.
Why not? Because if you propose that they save into your own format, you are going to be laughed out of the room. And if you propose to save into DocXML or Doc, you might get booted out. RTF might get considered but I suspect it too would be rejected. Which leaves you back at OpenDoc.
I really do want to love Abiword. I wouldn't be having this dicussion if I didn't care. Don't sit on the fence on this one any longer because remember, great software is opinionated!