That is my prediction as well. Watched a video from August of last year, Fusion could very well be a viable replacement for Photoshop and After Effects. Also, its particle system looks very promising. Will be interesting to see how tightly it becomes integrated with Resolve, could be a game changer. Until then, Final Cut and Motion are a good mix.
What could be interesting in all of this is the impact on Adobe and Avid. Wonder what shift there will be in the dynamics of the market. I sense another great debate.
My game plan is as follows based on the direction Resolve and Fusion take:
Short films, basic motion graphics and promos all done within a Final Cut Pro X, Motion environment. More complex finishing, projects and compositing done with a Resolve and Fusion workflow. Will consider processing stills in either Motion or Fusion based on complexity. Curious to hear what others think.