Ask-a-Dave's-Gardener: Declining tree?, 2 by Keyo

Keyo wrote:
I am looking for a second opinion before removing a black walnut. There was some damage to the base of the tree last year and this year the top half of the tree looks dead. There is some new growth coming up from the base of the tree and the tree faithfully produced walnuts. My tree person thinks the tree will continue on the decline. Are there any tree experts out there that can confirm the sad prognosis? Any thoughts?