Well, the airport configeration has been like that for a long time, what is changing is the volume of traffic and possibly the competence of the crews flying in. If for some reason a particular flight doesn't manage their spacing as anticipated then the crew in the tower have to deal with it.
Because of the closeness of 28L and R it is always a bottleneck for traffic flow when the weather is bad.
Back in the days of "steam" gauges the crew were paying attention 100% of the time, now, it seems, the FMS is programmed and if there is a last-minute runway change then rapid typing results, as the magic "follow the line" has to be displaced.
There is a youtube vid out there showing a Lufthansa 380 flight into SFO, naturally there was a runway change, the comment (from a Snr. Captain) was "typical"... so why was he surprised?.
Fly the aircraft, be prepared for the conditions and pay attention.
SFO isn't Denver.