European Council President Herman Van Rompuy, among others, seems to doubt the need for a new treaty, which would require the unanimous support of the member states – some of which are sharply opposed – to enter into force. Indeed, Cameron recognized this explicitly in his speech, so the new treaty to embody a “new settlement” for Britain may have to be negotiated with all member states as a separate exercise.
此外，卡梅伦的策略似乎不太可能取得所有人都满意的结果。如果谈判以更大范围的条约谈判为背景，那么或许在可以预见的未来都不会发生。以欧洲理事会主席赫尔曼·冯·范龙佩为首的许多人怀疑新条约的必要性，新条约需要各成员国一致支持（而有些成员国强烈反对）才能切实生效。事实上，卡梅隆在讲话中明确承认了这一点，因此包含针对英国“新方案”的新条约可能需要与所有成员国单独协商。