GEVCU 5 is designed to be much lower cost than GEVCU 3 and the BOM (including case) is 205 USD using MOUSER list prices. My guess is that we can keep it well under $200 in volume production.
Personally, I think the increased functionality is worth paying for and I don’t think 200 USD would stop many people from using OVMS/GEVCU when you consider dual-CAN, BT, WiFI, lots memory, flash, Android, etc. etc.
I also think sharing a common hardware platform would bring huge benefits in terms of future cost reductions, support, and development.