If the AV or later model does option a 3.8L V6, I hope they still keep the I6 as a option. That way you can let the buyers decide.
I6 is generally well liked, as much as a six can. With a turbo it would help smooth out that roughness high in the rev's and give it stomping performance.
Look how hard a time Holden had of selling the LS1 to people over the old Holden V8.. Most agree the LS1 is a excellent engine, its smooth, its alloy, its got 5.7 Litres, its came from the corrvette, its got plenty of room for more power. But people still dislike it, some for good reasons, others because of some what unfounded..
Concidering the US 3.8L V6 engines aren't well reguarded by anyone for alot of reasons, people are going to be sceptical of a new one instantly. People are afraid of unproven things.