Why would you queue the next thing you want last?
There currently is way to "queue" research topics, so this is a non-argument. Topics are added as they become available, with the newest one usually added last, but with no regards to research priority.
Priority changes as new topics become available, meaning your idea is kind of pointless unless we also have a way to reorder research topics, because the alternative is to manually delete and re-add research topics to reorder the queue. At that point it is less time consuming to simply reassign scientist.