I mean, Layton should really be the least of Phoenix's concerns when he has bigger fish to deal with that is his fellow Capcom buddies like Dante and Monster Hunter etc that may out prioritize him.
Layton is owned by a completely different company and its not like the appearance of Joker stopped us from receiving two more RPG guys in the same fighters pass.
Or even two fighting game characters relatively close to each other.
Not to mention the fact that Layton and Phoenix don't even really share the same genre to begin with, what with the former being a puzzle adventure series and the other being a visual novel adventure series..
Never understood why there is this seemingly bad blood between the two just because they had a crossover game once but oh well...