probably use mine to upgrade to a Disney Club Hopper Plus. They will give you credit for a 1-Day 1-Park against the total price, and if you divide the net cost by the number of days, it really brings the cost down per day and still gives you some admissions to the water parks.
If you are going for cheapest ticket price per day-the DC 5-Day Hopper turns out to $33.71 per day. I haven't figured out how to compare the Hopper Plus daily cost since there is not a comparable 6-Day or 7-Day Hopper, if that makes sense. Not sure the most accurate way to compare a 7-Day Hopper Plus to a regular 5-Day Hopper since you get the extra admissions.
Only thing I can come up with is that for a 7-Day Hopper minus the credit for the voucher, cost per day is $36.80, total overall additional cost over a regular 5-Day Hopper is $89.04. So for $89.04, you get 2 more days in the Parks and 4 Plus admissions, which to me is about $133 in savings, and the benefit that it will not expire.
Guess there are a zillion ways to look at it. I too am sad this is the last year. But I was not expecting these, so I am thrilled to death to get them.