In theory it is so.. but these electronic items will be expensive until they are mass produced at the million quantity level.
Capacitor durability in the inverter is an issue.. they do dry out after a few years if proper design margins are not kept. An easy way for OEMs to skimp on costs.
From the www.factorynissanparts.com, a replacement Leaf 80kW inverter is $3870, and the motor is $2054.. note a Volt uses two inverters and two motors but GM surely does not pay retail for those items. Anyone has the cost of the GM parts?