None taken, 3princessmom.
The way I read the rule was this:
The old park hoppers would be granted the dollar credit, but the new 1 day base ticket would be considered an upgrade. So technically, the old hoppers would just have their value counted towards the AP while the 1 day ticket is the one they base the upgrade on. So if the 1 day ticket is worth $60 and the old PH is valued at $24, then $84 would be counted towards the AP price.
That's how I was told by a CM at DTD (not that he couldn't be wrong). We were renewing our APs at the end of May and I asked him the very same question. We had an old PH that still had 2 pluses on it, and I asked him if I could get the credit from the old PH, add the 1 day base ticket and add my discount for next year's AP renewal. The CM said yes, they would be able to do that.