Wouldn't it be better to write a driver for one or two popular USB wireless adapters, which everybody can use?
From what I understand, the actual drivers are being developed by simply compiling the BSD drivers for OS/2. That has been done. The "problem" is that there is no interface to XWLAN (or something that does the same thing) to control the radio, and do the wireless logon. That part is still not complete, but, apparently, it is one of the highest priorities on the Arca Noae job list.
running ArcaOS in new laptops is pointless if wireless is not supported
Not really. There are other options, like using wired connections, or using one, of the many, adapters that connect to the laptop by wired NIC, and to WiFi by radio. Personally I use a D-Link L-506 device, which is useful for other things too (including charging my cell phone, if I need it). However, I am looking forward to having a proper driver, with support, for my WiFi adapters, mostly because the D-Link adapter is also being used as a WiFi extender.