Guildhests were made strictly to teach people the basic mechanics of things. The roulette for it was just tossed there to try and get people to keep doing them so newbies could learn from them. MSQ Roulette will never be anything but Prae and Castrum because that's what it was designed for, a story boost with giant exp/tomes/etc to help new players get through those two dungeons. The only thing that *could* change, would be to up the rewards on the Guildhest roulette just so people do them again for new players, buuuuuut... eh.