Wireless under Amiga is possible.
I am already using a PCMCIA wireless network card on my Amiga 1200 under OS 3.1 & 3.5, OS4 and MorphOS. It is a NetGear MA401 card.
I am also using a wireless PCI NetWork card on my AmigaOne.
http://amigakit.leamancomputing.com/catalog/product_info.php?cPath=32&products_id=158prism2.device does the trick for both of those cards.
On my 4000 I got this USB 2 LAN adapter working fine with Deneb under 3.9, 4.0 and MorphOS.
It would be great if USB 2 wireless LAN could be brought on the classic Amiga. Perhaps through an updated version of prism2.device and / or support to Poseidon.