In the past many agencies would not consider foster parents as applicants for adoption, but this is no longer true. If you are meeting a child's needs and are willing to take on all the added responsibilities of adoption, you are likely to be the first family considered. If you are able to do it, then the child gets a permanent home without suffering another separation. The strongest pressure may come from the child who may be afraid of another change. Your bowing to such pressure will not prove to be best for the child in the long run.
Adoption is serious, at least as serious as marriage.
It is a permanent commitment. It is making someone else a permanent member of your family with all that is involved emotionally and legally. It cannot be taken lightly. Some foster parents have been hesitant to adopt because they do not feel they could take care of the children without the financial assistance of foster care payments. If this is the only reason, you should be aware that the agency may be able to subsidize such a placement even after a legal adoption.