That is true, although I think a lot of what can be invested in, is transferable. Control software, targeting, AI could be adapted to larger or smaller scale drones. Manufacturing capabilities can be as well. ISR drones are pervasive and it used to be uneconomical to shoot down a relatively cheap one, like an Orlan, with something that cost as much or more. Now there's cheap counter-ISR FPVs. I don't think the future is manually guided at all though.