Regarding SJ Liberals, they may be more likely to be very "traditional" liberals, and very much in lockstep with Democratic policy. SPs and NTs are more often independent, or at odds with their party for one reason or another.
My evidence would be that our society prizes individuality, pragmatic realism, adaptability and ability to cope with change much more than it used to be. These are typically not SJ strengths. Hierarchies are flatter than they used to be, and we're results-driven rather than process-driven (excepting some big institutions like government). Big corporations, which are dominated by SJ hierarchies have had massive downsizing. They have laid off middle management and hired more consultants and tech staff (more likely STP or NT from my experience).
In contrast, we're seeing more opportunities in areas like higher education, technology/science, and design. Higher education was once reserved for the wealthy, so was good design, whether that's fashion, interior design, whatever. Now everyone wants this. All this has meant a better crack at life for NT, NF, and SP types. Since marketing and trends often follow those with the cash, we're not catering as much to SJs now.
I bring up the formal fine dining example, because although it's trivial to us, it was a very important ritual for older SJs. They dressed up to exacting standards, and entered a world in which status and money were very important, and were treated to a very exacting and predictable standard of formal and mannered service. Nowadays, you can go to an expensive restaurant with top-notch food but the atmosphere and service are casual. The waiter treats you like a drinking buddy and they've probably playing Cat Power or electronica. I'm a bit of a foodie, and I like this trend, but then I'm SP. But my SJ father consistently voices his disapproval and dismay about this.
Another example ... A clean, spotless house used to be very important for proper standing and to reflect the right values, especially when entertaining. My SJ aunt vacuumed her entire house every day! But standards of housekeeping have declined as both parents are often working, people don't have formal dinner parties, and people just don't care. Again, stuff like this has hit older SJs hard.