2/3 of Americans polled wanting permanent DST,

Yes Americans want permanent DST like in 1970.

massive technological advancement,

Why specifcally would cause a need for a change in sunrise/sunset?

There was massive technological change from 1920 to 1970 when it was given up for 2 years before it was changed back.

ever-growing proportion of renewable energy?

The current shift to solar would mean an even greater need to synchronize energy use with sunlight.