I think that would be a great idea. Persona Q's gameplay is very similar to Persona 1's. A game that could combine aspects of the teo could mesh really well. Persona 1 and 2 also have amazing casts of characters with great chemistry. I specifically think that the Persona 1 and Persona 2 Innocent Sin casts would get along really well. I could also see the story having a darker and perhaps more mature tone than the modern games, which might prove to be a nice deviation from the norm.