cooldoc80, you can not use your wife to maintain her residency as a PR and then come and "touch it onto you" where you are. Your PR is only protected if:
a) you are accompanying a Canadian citizen spouse in another country,
b) you are a PR who is working for a Canadian employer who has transferred you,
c) you are accompanying a PR spouse who falls under b)
You will therefore get credit for 3 months a year you are in Canada but you will not get credit for 3 months a year your wife is staying with you in another country so with 3 months a year in Canada, you will lose your PR after 4 years of doing this. You may however get away with travelling to Canada on your PR card until it expires. It is not certain that your PR status will be questioned on entry.
Your wife will be applying for citizenship after 4 years like you said. She must be careful that she is not gone for more than 3 months a year because you can only count time in Canada in the previous 4 years before you apply for citizenship and she must have at least 1095 days (3 years) during those 4 years. She will take about a year to get her citizenship after she applies.
She can sponsor you again like you said but if you are not planning to move to Canada at that point, why not wait with the sponsorship until you are ready to move? If she sponsors you again as soon as you have lost your PR, you will be hoping to keep your PR while living in another country based on that you are accompanying her there. While it is possible that you will get away with it, it is also possible that the visa officer will look at it and say, hey, you have lived there the whole time, you had the job, you are not really accompanying her but the other way around. There are cases of people being refused for that reason. If you wait with the sponsorship until and if you are ready to move to Canada again, as a citizen, she doesn't have to be residing in Canada to sponsor you. She would however have to show that you are ready to move to Canada once you get your PR and that could be a hurdle if you had PR before and were not ready to move to Canada then.