There are a couple of simple implementations I wouldn't be surprised to see that would help curb some of the more extreme uses of the plan, but can still accomodate most guests appropriately.
1: If the party size is the same as or less than the number of guests on the card, everyone in the party pays with the plan, or everyone in the party pays OOP, charging a number of credits equal to the # of meals ordered.
2: A modest, but non-trivial plate splitting charge. This is not that unusual---many quality restaurants do this, and Blue Bayou at
Disneyland does, now too. Something on the order of $5. The reasoning behind this is: it takes additional effort to plate one entree twice, and most of these places (including, I believe, Blue Bayou) will plate each of the 1/2 entrees with its own set of side items. This would always be charged as a cash cost (like an alcoholic drink), unless the guest specifically asks to have a credit deducted for it.
3: Everyone at the table is either ordering a meal, or paying a split plate charge.
This wouldn't be *that* much of a hardship for people using the plan in the way that Disney most likely expected---if they want an extra TS meal (or, say, a signature meal) they can choose to pay for their least expensive meal out of pocket, for not much more money than just banking enough kids meals to cover it. People on the plan could still treat their guests who join them for a meal. People who are very light eaters would pay only slightly more than they do now, but it would reflect the additional service load. And, the plan can still be used almost as flexibly as it is now.
No matter what happens, it seems that *someone* at WDW has decided that the plan's currently flexibility is being used to its fullest extent by enough people that they want to put a stop to it somehow. The alternative to reducing that flexibility will be to increase the price of the plan across the board. Based on all the heat coming from folks at CRO about no sharing, no splitting bills, etc., it sure looks to me as though one or the other is inevitable.