Convert bathroom to shower room?

We live in a 3 bed semi, a family home even though there are only 2 of us. I am thinking about future-proofing now that we have both retired but want to get some opinions from others. Should we convert the bathroom into a shower room (it is the only one in the house, although we have very small a downstairs cloakroom). The bathroom is not large and at the moment we have a P shaped bath with a mains shower over it and curved glass screens. Has anyone else done this, and do you think it would affect the re-sale value eventually? Thanks for any advice you can give.