This practice could lead to widespread changes in the future, as deceased actors come back to life, and aging stars are kept young through the power of technology — which is something the Marvel Cinematic Universe has already made great strides towards.
The overall implications of these Star Wars resurrections extend far beyond simply being a neat post-production trick; this could be huge for the future of cinema.
Although we are not at the point where we can give deceased actors leading roles in blockbuster franchises (Tarkin still definitely looks somewhat fake after long stretches on screen), we are gradually reaching a level of technological advancement in which these iconic characters may legitimately never go away.