Voice has a long way to go to be really useful. It also clunky and slow, so you need to move a lot of the inteligence into the system I think.
As an example you couldnt really shop fast with voice but if the system was smart enough to execute 'buy motor oil' and automatically know your car, what deals are typical on motoroil, factor in shipping and all that. Right now you take gamble on price and so on - of course super simplified example and at that point the car would do it by itself (and aboslute anyway due to electric)..
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Great point—voice assistants won't truly feel "smart" until they actually know more stuff about us and can use that data to speed things up.
Pricing too high and should be possibly be tiered based on user type.
Almost infinite integration options - works well with almost everything