It's inevitable that with each new technology that gets squeezed into the ever decreasing physical footprint of mobile devices that there comes a potentially significant rise in power consumption.
Increasing the size and weight of a device is not generally an option in the heavily competitive mobile devices market, so we need to get creative and discover new ways to reduce power consumption and hence increase battery life.
If you are a technological optimist, you might hold out hope that given time and market pressures a new, lighter weight and\or more compact battery\power technology would be sure to come along and save the day. Problem with that theory is that the device manufacturers will no doubt use this new feature to reduce the size and weight of their devices still further, so we are back at the same problem of conserving power consumption, for at least the foreseeable future.
So... that's one of the many adventures that I will be engaged in off and on for the next few months - minding my milliwatts.