There are three elements there though: 1) the capture of all the musical and performance input (a wind controller, etc) 2) the transmission of all that informa

There are three elements there though: 1) the capture of all the musical and performance input (a wind controller, etc) 2) the transmission of all that information in real-time without latency 3) the conversion of that information into the appropriate sound. Midi is only part 2 of that - advances in other areas are needed for a fully convincing facsimile, but given the incredible improvement in sample-based libraries over the last 10 years or so (and even more so comparing something like a Spitfire Audio library to a synth string patch), it is possible that will be the case, given the investment of time, brains and money.