How far apart are the sensors? How are you going to connect 1000 of them to a single PC? A 1000 port router is going to set you back a few thousand dollars.
I wanted to use ethernet because the topology is simple.I plan to use 4+ routers and each router will have few switches.Each switch will have few sub switches.
This way I will get all sensors connected.Then my processing will be done on PC that just go two the each network and make http request to each sensor.
I was thinking about the same but there are many machines in this small factory and I am not sure how 1000+ rf modules will work in the same place without many noises.Also each sensor should be powered with two wires.So in each case I need two wires to the sensor/for power supply/.If I just use cat5e I can use it for the ethernet card and power.The switches and routers are cheap enought and the cat5e cable is around 50Eur for 300m.The RJ45 plugs are also very cheap.
But I still like your idea.
I will have to read more about those 2.4Ghz wireless modules and maybe I can change my mind in this direction.