You're actually not doing all that much with your wireless network.
* Streaming music, while performance sensitive, is only going to be using about 256kbps. Even with two of them running, and factoring in collision, you're going to be well under the 1Mbps mark. (Assuming you're streaming compressed stereo signals, not raw wave data or surround sound). Streaming music is nothing compared to video.
* Print jobs are not performance critical. They'll happily retransmit the packets until all the data arrives. Most printers have crap processors in them anyway, so you'll always spend longer rendering the job than transmitting it. (Assuming you don't have a high-end multi-tens-of-thousands-of-dollars printer)
* RDP-style apps and VPN are made to run over unreliable links. Try using VNC (with all the options enabled) over your wireless network, and you'll see what good protocol design is doing for you. Citrix and MSRDP are extremely low bandwidth applications: they work by bundling and transmitting the raw gui requests, not the screen data. All the rendering is done on the client side.
Don't forget that 802.11g is able to go at 54Mbps - that's nothing to be sneezed at. It depends heavily on your environment though. Most people should only expect 20Mbps though, and if you've got brick, concrete or non-wooden-frame construction, you better be happy with about 10-15Mbps even between adjacent rooms.
No - believe me: There's no magical technology coming (I really do know what I'm talking about here). Everyone's sights are set on getting 802.11n finished at the moment. They can approximately double the speed of current (11g) wireless technology just by reversing a bunch of brain-dead decisions they made back in the early days. They can get a bit more out by upping the power a little (but not too much). To get higher bandwidth beyond that, they need to increase the frequency of the signal (see "Shannon's Law" link in my previous post for details - the problem is that it's impossible to reduce the "N" part of the equation unless you put your house in a magnetic cage). They're doubling the frequency for 11n.
As the frequency of microwaves increases, their permeability in air is reduced (it improves again up around the visible spectrum, but then you can't get through walls, and it would be a bit annoying having the room light up everytime someone transmits data
). Wireless may get up to Gbps rates eventually, but it's going to take a long time, and I doubt most users will ever see past a couple of hundred Mbps, because they don't want wireless technology to dictate the materials from which their houses are built.
