Don't you think that the idea of being biologically related will become more obsolete in the future?
ご質問ありがとうございます。
"Don't you think that"=「~だと思いませんか」
"the idea of being biologically related"=「血縁という概念」
"will become more obsolete"=「は廃れてくる」
"in the future?"=「将来は?」
(又は、"in the coming years"=「この何年かで」というフレーズも使えます)
ご参考になると良いです!