Less than 1 out of every 20 deaths are from traffic accidents. It's higher for young adults mainly because young adults have a near zero death rate.
We had a spike in 2015 & 2016, and one in 2012, and every other year over the last decade the death rate has declined. The article you linked to emphasized the increase in deaths, and downplayed the increased number of miles driven, which is misleading. Deaths per mile only increased 3%.
And we've seen these spikes before, about one or two per decade and they don't change long term trends. In 1961-63 they spiked 6% per mile driven and 4% in 1965-66, since then death rates have declined 80%.
2015 was the 5th safest year ever for US auto travel. It's death per million miles was 1.12, in the 2000-2009 the death rate averaged 1.41 per million miles, meaning they've still declined 20% over the last decade, even with the recent spike.
Self driving cars aren't very speculative any more, it's not a question of if, just when. But automatic braking systems and lane safety systems exist today. Honda offers "Collision Mitigation Braking System (CMBS™)" as an option on most of it's cars already.
https://techinfo.honda.com/rjanisis/pubs/om/JA0606/JA0606O00...
Honda also offers a collision warning feature, lane keeping assist system, road departure mitigation, lane departure warning, and adaptive cruise control with low speed follow. All of these systems exist today, and are offered by most manufacturers as options. They haven't had a big impact yet because they are options, and haven't been offered for very long so they are on a minuscule portion of the cars on the road.
But as their costs drop, just like ABS and other safety features, they will become standard equipment and after another decade or so it will be difficult to find a car that doesn't have them.