Being a creative all my life, I have always believed in giving new talent a chance...it's only fair.
Well, as a "creative" myself, let me just point out that, at any given time, I'm usually working for at least three different franchises, from various studios and publishers.
As long as I meet my deadlines, and don't prioritize one project over another, nobody has ever complained to me about conflicts of interest . . . .
It's all about logistics and time-management. Nothing more.