Its good you are thinking of ideas.
The main drawbacks are these.
Magnetic woofer connections - Not a solid connection, current and voltage transfer capabilities would be on the low end. Susceptible to vibration and high power may induce arcing at connection which would create heat at connector.
Bluetooth amp signal input. - Bluetooth is basically a radio transmitter and receiver. Because of this, interference from outside sources is possible, signal to noise ratio is diminished from standard hard lines, signal voltage is limited, and frequency response is limited.