You have every right to request that the speech hours remain the same. The biggest reason to reduce hours, besides making progress and needing less, is that the speech hours are lost class time. In middle school, if a student has a resource class, that's fine if they get pulled out of there. But often the missed class time becomes an issue. When I worked in elementary school, I had a student who was consistently pulled out of social studies because that was considered least important given her academic IEP goals. However, she was missing so much social studies that she was not able to complete a lot of the graded work and it became an issue. So at any level, missed class time is something to consider.