Your needs and personal preference should always prevail. However, one should never lose sight of the distant possibility of selling in the future.
With this said, it9;s not the size of the bath that is a major concern but the fact that each level would have greater appeal with both toilet and shower/bath accomodations. In our opinion to remodel and eliminate totally the shower/bath arrangement could be a great mistake. Each bath should have either a shower or a bath for best resale potential.
Good luck with your project!