We had a bunch of old paper non-expiring park hopper plus tickets converted to newer plastic ones suitable for my disney experience earlier this year (February) and they just converted all the extra non-park tickets into to flexible passes we could use at any of the small attractions (Disneyquest, Waterparks, Minigolf).
Believe me, I'm fuzzy on the details, but...
The tickets originally had several things on them as separate admissions (Again Minigolf, Waterparks, Disney Quest), something like 1 or 2 each, for each thing. I believe each ticket had something like 2 DQ days, 2 Waterpark days and 1 minigolf, but I don't recall vividly. We used the Disney quest admissions long ago, but we're not waterpark people, and we never get around to minigolf, so those were unused. At the time we upgraded them to the new system, the guy told us he was converting our multitude of waterpark and minigolf admissions to flexible plus admissions, and we could now use them on Disney Quest as well, should we choose to. And since we have no desire to waterpark, we now have a metric butt-ton of Disneyquest admissions. More than we know what to do with most trips.
Your mileage may vary based on whatever employee you speak with at the time, but yes, we personally were able to get our waterpark admissions changed to disneyquest admissions when we upgraded our old paper tickets to the new system.