Granite is really cool, I have it myself. Looks amazing, indestructible, low maintenance, you can cut directly on the surface ... the only disadvantage in my opinion is the weight. But we managed to get it in without a crane, although it was at the limit for 4 people. They were really out of breath. ;)
You can also get it out in one piece after 20 years if you want, but then you would have to find someone who wants the slab(s) with exactly the openings for the stove, sink, and drillings and exactly in that color with a few scratches, that person would practically have to plan their kitchen around the slabs ... the chance is zero. So you can also break them and "craft" something from the leftover pieces.
Although I rather assume that the kitchen will be shabby by then and you can bring the granite back to life with a polish.
But yes, quickly from the clearance sale it will hardly work.
Best regards
Dirk Grafe