That all depends, can a Limited Wish allow someone to learn magic, how about a Wish? If either is true, especially with Limited Wish, you've got a source for more mages. Then add in the ability of Wish to give someone +5 to their stats. I'd guess that a powerful mage going from 18 INT to 23 INT is going to be fairly impressive, and that such an upgraded person could do considerable amounts at advancing both mundane and magical technology.