My condolences. Times like this can be very trying. Hope slips through your fingers like water in a washbowl. Normally, in a divorce, or separation, one knows that the other doesn't want a renewal of committal. In the case of a coma, you must live with the understanding that your wife, should she awake, will expect to find you by her side as if it were tomorrow, instead of next year. With that in mind, any new commitment you might make to another mate, will always be tainted with the stain of abandonment from this union.
That is a tough place to be. I would suggest you play the field for a while, instead of actively pursuing another mate at this point. If you feel the need to do otherwise, than, file for divorce. Otherwise, use Rosy and her four daughters, or pay for professional services. Get into therapy.