My gut feeling on it is there's a HUGE difference from the sort of cultural and genre data mining Hendrix was doing and say The Stray Cats. There was the beginnings of the sort of time/place/era lifting we see now for a long time, but the band that really just nailed this phenomena for me as a kid was the Stray Cats, an 80's band doing very exclusively 50's rock.
They were good at it and the songs were catchy, but because in the end they added absolutely nothing new to the table, they will be completely forgotten.
With few exceptions the best bands bring together different elements and create something new. The Beatles brought together american blues and rock, English big band melodies, and beer hall pop among other things. Hendrix brought funk, Blues, rock and a bit of crazy experimental acid music among other things.
So, to me anyway, The White Stripes etc. are good craftsmen but bad artists. It's like an exceptionally good painting of a lighthouse and the ocean. Great technique bad art. This doesn't mean they're not fun to listen to but it's kinda like a candy bar compared to a meal.
Theres a spectrum of creative synthesis, running from a group like Stray Cats doing a cheesy pastiche (taking one thing and recreating it with all the integrity of Disneyland) . Higher levels of personal creativity involving the synthesis of several similar items, and then on to many dissimilar items, onward. At that more complex union the variation of influences combine into a new whole.
I agree that some white Swiss guy playing blues is never a black man in the 1950s, but it has its own cultural validity, as a trend. In the same way that geeks on here were excited about a "new" MS20(a seriously limited semi modular now easily surpassed), or might fetishise a 909's retro drum appeal . Appropriation is our culture now. THAT is the authentic culture of of now, so sing me an authentic song about your Studer tape modelling plugin.
Meanwhile : I think everyone is still looking for an outmoded idea, a musical undiscovered tribesman, pure and unique. The noble savage. Untainted by the hypermediated world we look for a pure innocent to appear Authentically singing a singular authentic existentialist song.We say "don't sing like I've heard before, sing like I've never
heard before. It can't be authentic if you sing like they did in '50s Tennessee "
The reality of such a mythical un-tainted Authentic beast is :
#1 he doesn't exist, because every thing is connected to everything else now.
#2 if a musical noble savage DID appear his music would have little cultural relevance ( and thats how we value cultural output) our culture is one of deep references.
Our sense of cultural value is based on cultural novelty, but it's very hard to be surprised by a culture these days. The blues was a synthesis which built over decades. We no longer have decades of relative cultural isolation to distil, forget, and then ship over to Liverpudlians.
If some Japanese kid farts an 8 bit limerick I'll be watching a cat-based remix by lunchtime tomorrow.