I would keep doing it as long as the child is interested in it, and might even press the issue a while later.
Jim Trelease is an advocate of reading aloud thoughout (at least) the elementary years, and his research is compelling. He has published collections of stories and book recommendations that are age appropriate as children grow up.
This story of a father and daughter who read aloud together for 8+ years starting in elementary school is compelling.
Do be aware of the difference between reading aloud as a fun, together activity and reading aloud as a trigger to wind down. If the same books are selected over and over, then it is more likely the latter. That I would stop that part of it by selecting more interesting stories and not repeating very often. I would also move the reading aloud earlier in the routine, say before brushing of teeth.
Have you seen the Princess Bride? The story is told as a child being read to by his grandfather.