I think we have to examine this from each person's viewpoint: the viewpoint of the dead-then-resurrected person, the viewpoint of the surviving spouse, and the viewpoint of the new spouse. And based on the assumption that the original couple loved each other and wanted to be together forever, as opposed to one or both wanting out of the marriage anyway. Also, assuming that this whole teaching is true as taught by the JWs.
Would I want my wife to wait for me after my death, and be alone for the rest of this system? Or would I want her to move on and find someone new, someone who could give her the love she still deserves and that I'd not be able to give her anymore? Someone who could take her to all the places she likes to go. I would not want her to stay home crying and being alone. I would not want her to become an old spinster. I'd want her to heal after grieving and to continue to have a happy life. When I'd wake up in the resurrection I'd be interested in finding out how she coped and adjusted, if she made it OK. I'd even be thankful that the new man did take care of her and bring her comfort and happiness. After all, I couldn't have done so once I had died.
If I were the surviving spouse....I would grieve of course. But would I want to be alone for the rest of this sytem? Or would I want a companion, to help fill the now empty place in my heart. Perhaps the new woman would also be grieving over her late husband. She and I could help each other to go on. I wouldn't be replacing him and she wouldn't be looking for a replacement. We would be simply picking up the pieces and continuing with our lives, together. I would be thinking, "What I'm doing for her is what I'd want another man to do for my 1st wife if I had died and left her behind."