Yes, but not until 802.11ad 60Ghz that travels nothing more than a few meters with line-of-sight.
Wireless is wireless in the sense of the last mile.
While I'm sure that is a vision shared by many people, one of the reason it didn't gain popularity could simply because it is just unreliable, so unreliable that no one dares to guarantee the result at all, unless you make it as a system, in return greatly limited the application/usage. Certainly hurt a lot, be it R&D or potential market reach.
Wireless Speaker Synchronization: Solved
http://www.aes.org/e-lib/browse.cfm?elib=17878
"Digital wireless audio systems are technically challenging to implement. For example, many highend stereo systems offer a ‘party mode’ where several devices are linked together to play the same audio stream to create a multi-room experience. However sometimes the network is unreliable, perhaps the environmental conditions for Wi-Fi are unfavourable, or the location of the transmitter is unsuitable. Networked audio devices rely upon a master clock to keep them all synchronized. If that clock signal is lost or delayed due to insufficient bandwidth or intermittent network communications then ‘party mode’ rapidly degrades into a jumbled cacophony of sound. The timing problem is even more critical when considering multi-channel wireless speaker systems, such as those organized as stereo pairs or in building 5.1 configurations for surround sound.
One of the main difficulties in synchronizing streams over TCP/IP networks is that they employ ‘best effort’ methods to deliver IP packets – there’s no guarantee of delivery and packets can arrive randomly, albeit within a reasonably predicable timeframe. Even using timestamped multicast streams, clients will drift out of synchronization and need to be periodically corrected. In the case of audio-visual stream delivery, the inherent latency within the network is often too large and unpredictable to reliably synchronize streams between several client devices. Whilst it’s true that software time-stamping protocols running over TCP/IP can provide some degree of synchronization between pairs of devices, these methods have to factor in network latency and round-trip packet times and are therefore not fine-grained enough for audio, especially when maintaining separation between stereo audio channels or recreating perfect 5.1 surround sound. "
An Evaluation Tool for Wireless Digital Audio Applications (old, but you get the idea)
http://www.aes.org/e-lib/browse.cfm?elib=13102
"While the wireless transmission protocol employed provides QoS service guarantees, it is evident that significant reproduction distortion may be introduced, due to the non-ideal nature of the wireless channel, which may cause lack of data in the reception buffers or packet overflows in the transmission queue. Moreover, playback distortions induced only in one audio stream, can lead to out-of-phase reproduction between channels, as shown in the example test case. "
And of course, I can't recommend this paper more, from TI
Challenges in 2.4 GHz Wireless Audio Streaming
http://www.aes.org/e-lib/browse.cfm?elib=16075