Wireless charging is inefficient, 50% to 75% for the wireless part.Yes, it would be great if Apple could create magnetic connectors. But I think with Intel's Skylake processors, beginning next year, there will be wireless interfaces that allow peripherals to be connected without any wires or cables, so magnetic connectors may be unnecessary now.
Achieving data rates like Thunderbolt (40Gb in 40Gb out)requires a very wide bandwidth, thus a very high frequency. The higher the frequency, the more line of sight is required, and the more materials block the signal (anything that heats up in a microwave blocks signals above microwave frequencies (2.4GHz). 5G WiFi relies on one or more reflections to go "thru" (actually around) walls.