I've seen this same role reversal with women whose husband's own their own business. The recommendation in this case is to definitely consult with a lawyer so you can be fully prepared (but do not tell her and hide any paperwork or information about this!!!). At this point you do have to assume your wife could file and may do so.

Learn what you will need to do. Also, I don't know what your training or education is, but you will need to begin thinking about going back into a career or getting more education to enter back in the workforce. This will help your PMA tremendously. It will help you feel more confident, and will really help boost your self-esteem. Since you are financially dependent on her, it's time to start thinking about how you can eventually become financially independent or employable the moment you need to be. I realize this is difficult in this economy, but there are opportunities and this should become part of your GALing. You shouldn't put this off.

I think you have a lot of work to do on yourself before you are in any position to rebuild or save your marriage. My opinion is you need to seriously detach and work on you. Based on things you've written, I think if your wife miraculously changed her mind tomorrow and wanted to stay in the marriage there is still A LOT of work you would need to do within yourself to make it work. You need to pull out of the drama with her and work on YOU.

You are wasting time and effort worrying about what she's going to do. Just start preparing to have a great existence with or without her.

There is no arriving, ever. It is all a continual becoming.