It is possible to find vintage speakers 30 years old still performing.
Do you really think that the hi tech active speakers from nowadays will be alive in 30 years?
40 years ago there was a french company that made active speakers.
At this date there may still exist one of 2 units as collector piece (I have seen pictures of them).
It is a little similar with the mechanical DSLR versus the digital camera.
You only keep the Leica on the field through centuries.
Digital equipment are for instant use and later going to the trash.
I may have five old digital cameras: they are obsolete.
But I go on buying digital camera.
As I am keeping my speakers a very long time I will go on with passive ones.
Only the sub will be active (a passive sub is a non sense nowadays).
I have active logitech speakers and subwoofer for my computer setup, probably 15 years old, works perfectly fine. I have a Canon 60D DSLR, bought in 2010, works perfectly fine, the picture quality is still great, still no problem to connect it to a computer and transfer pictures.
If I buy a fancy mid-priced active speaker with spotify connect and apple airplay and whatever built-in, will all that still work in 20 years? Maybe not. But if I buy a quality active speakers who concentrate on being just that, without tons of connectivity to all kinds of digital services, will that still work in 20 years? I think that's pretty likely.
If "will this piece of equipment still work in 30 years" is an important part of your buying decision, passive speakers may likely be the better choice. Not sure that's a major concern for most buyers though. I don't know how many passive speakers I've owned the last 30 years (lost count).