Nah, Joe Consumer is not going know what's draining his smartphone battery.why not give people CHOICE (that's a great concept isn't it?) - users would be able to disable the plug in if not satisfied with its performance or if system resources needed to be used efficaciously (i.e. extend battery life)....
That's why manufacturers of other smartphones have been reluctant to offer Flash. That's also why the Mozilla Foundation dumped Flash support before they shipped Firefox Mobile for Maemo devices.