Microsoft and fast reliable networking - now that's a silly idea only dreamed of by fools.
I use Virgin Media cable for my internet - 100Mb - so already the slow network adapter on the x-box can't give me my full internet bandwidth. Wireless is a waste of space unless you can use 5Ghz range.
Microsoft need to wake-up and smell the future, overlooking the fact that in real terms networking speeds are quoted to include both directions - so 100Mb in reality is only 50Mb not taking in to account any deduction for overhead.
Not very good and so not future proof.