There might be some good discussion going on in your child's IEP meeting, but unless these discussions actually get written down in the IEP, the services will not be required by law to be implemented. The reason the members of the IEP team are defined in the law is so that the provisions decided upon by the team members can be documented and implemented. This is a great complaint among many families who attend IEP meetings. If the team member who says this has a legitimate reason for needing to get additional information before writing the service down on the IEP, establish clear protocol on who and when they will "get back to you" on this.
"This is a really important service/goal for Spencer that we are discussing. Who do you need to talk to, to get additional information, how will it influence the decision we make here as a team, and exactly when can you get the information back to me on what it will take to get this written into Spencer's IEP."
"I really don't feel comfortable with delaying this decision about Mary Kate. If we feel as a team that this service/goal needs to be included in Mary Kate's IEP, let's go ahead and write it in, and then we can meet again about how this will be implemented. If you disagree that what we are talking about is not necessary for her, then let's go over this again, and make sure we are either agreeing or disagreeing about this consideration."