All I know is I have loved all the other FFG Warhammer games I've bought (Blood Bowl, Space Hulk etc).
However when I bought the latest edition of Space Hulk by Games Workshop I was let down. The minis were great but I feel that's all they are good at with their games being dated. Even their new one Asassinorum wasn't great.
As for could FFG make a mini based game? Well, my growing collections of Imperial Assault and Battlelore would suggest that they can.