I work in an office with a lot of 2.4 GHZ wifi going on - bluetooth anything (including keyboard and mouse) doesn't work worth a damned in that environment.
Wireless is a poor substitute for wired in most real-world usecases. Wireless gives you: unpredictable performance, latency, contention for available frequencies, and having to deal with batteries.
I think it's OK for wifi, only because most of the time the bandwidth of wifi is greater than the bandwidth of your ISP. But I think that's a problem with the state of ISPs, not a blessing of wifi.