I think what you're suggesting is the dilemma we're in, which is how you promote and engage people in adoption for older children and sibling groups in a respectful way. It can be challenging for people to feel comfortable with that modality. You're not wrong to ask the question; it's what agencies throughout North America have found in making these decisions. Which is worse? Is it worse to promote the fact that children are available to adopt or worse to consider letting children languish in care because we're not able to communicate? It's an interesting values dilemma that we all struggle with in reaching a decision.
In our agency, we have made the decision that if we're inclusive and respectful in how we do it, the issue is to ensure that we meet the expectations of the child, which is to have a forever family. If there are ways that we can do it without having to try these social marketing techniques, we would be happy to go forward with those ideas as well.