Soil grade is above foundation
How significant of a problem is having the grade above the foundation line?
  


Soil above the foundation means that critters (rodents, worms, reptiles, etc.), bacteria, molds, and water can easily access the siding and infiltrate the walls.  Some of these can rapidly deteriorate the structure in a matter of a year or two in contrast to a building lasting 100 or more years.


  
  Are there reliable technological solutions that would prevent us from digging up and replanting all of our trees and shrubs surrounding the house?
  


Yes.  Use a shovel to remove the soil next to the house.  You do not have to regrade the whole lot.  A foot wide trench next to the house is plenty for this concern, though channeling runoff away from the house should also be addressed.  That could be as simple as putting in a few drain lines at strategic points.


  
  What kind of professionals do I need to consult to get this done properly?
  


I would start by looking around your neighborhood and see what works and what does not.  Imitate the successes.