I think there are going to be some sensors that an extendable mast will have that UAVs today and in the near future still cannot quite fully accommodate.
The lower profile/signature of masts are also a differentiator wrt UAVs.
That said, I expect UAV capabilities to proliferate overall among standard IFVs and AFVs more generally, so it's fair to say that many traditional recce IFV capabilities will be pushed down to regular forces, while recce IFVs hold onto a few more niche capabilities for specific mission sets.
