I'm kind of in the same boat as you, only I keep all of my documents in OpenDocument format. I was hopeful that I would at least be able to export my documents in OpenDocument format, but for the third Pages release I've been disappointed. I guess the concept of a vendor neutral open standard isn't ready to be realized, or hasn't got the market behind it, or something.
Anyway, this is, of course, going to be a personal decision, but in making your decision ask yourself a few questions:
- How many .doc's do I have that I would have to convert to do a total change (note that if you decide to switch back later you'll have to re-convert or pull from an outdated backup.
- How may .docs do you have that change very often? Of the 1500 or so OpenDocument files that I have, only 20 or so have even been opened in the last two months.
- Ultimately, the question is, do I want to use a program that I like better/works better for me at the cost of more flexible document format, or vice versa.
- How many documents do I need to share with people on non-OS X platforms? Would it be acceptable for these people to receive a PDF?
- Are you okay in not keeping your data in a more ubiquitous format, versus keeping it in a format that's a little more unsteady that you're sure is going to be updated in the near to moderate future.
More to your point, I don't think we're doing to see a native "Save" in any format other than .pages any time soon. Can you imagine the backlash when somebody edited a Word document and a pixel was out of place when opening it back up on MS Word for Windows? Apple would be accused of not playing nice, when in fact it was struggling to reverse engineer Microsoft's closed off and proprietary file format. If Apple does include native Save As into another document format, I don't think it'll be the old .doc.
I'm still not sure about the answers to these questions as for myself. I have iWork '08 but haven't used it much since I decided to use OpenDocument files exclusively--I basically built a cause around using OpenDocument, but I won't lie, both OpenOffice and Symphony just feel unproductive and clunky compared to Pages. Truth be told, Pages is like a breath of fresh air.
Very long story short, it comes down to what works best for you.