As I mentioned elsewhere, more changes are possibly on the way in an attempt to fix the system.
Dated one park, one day tickets. No reservation needed since you reserve when buying (see Paris)
Other media, potentially hoppers and resort packages with tickets, and also ticket add ons, will also be date based when purchased. Sales will stop for a given day when a limit is reached.
Prices for all the above will vary depending on day / date and park.
Hopping limits are likely to be removed for various admission media.
These changes could be implemented in the near term.