Old growth drivers are yet to be replaced by new ones.

参考译文：驾龄时间很长的司机们有待于被年轻司机们所取代/替代。 

名词不定式只能做及物动词的宾语，那该句子结构如何分析？

句子语法结构分析如下：

主语：Old growth driver

谓语：are yet to be replaced

状语：by new ones

特别备注以下2点

(1)句子句中 “主动are yet to do 属于有待做某事/被动are yet to be done 属于有待被做某事”。

(2)句中are to属于情态动词含义+动词原形，不能理解不定式作表语结构。

(3)A be replaced by B 意思“A被B所取代/替代”

关于副词yet用后接不定式时（尤其用于have yet to do sth, be yet to do sth等少数结构），意思是“还没有做某事”“尚未做某事”“有待做某事”“不曾做某事”。

(1)have yet to do sth 还没有做某事

The medical experts have yet to report in full. 

医学专家们还得全面汇报。

He had yet to accomplish anything of substance. 

他至今尚未有任何实质性成就。

The company has yet to provide an adequate explanation for its actions. 

该公司对其行为仍未作出充分解释。

(2)be yet to do sth 尚未做某事/有待做某事

The most exciting part is yet to come. 

最激动人心的一刻还没到来。

The cutoff date for registering is yet to be announced. 

注册的截止日期尚未公布。

“Who’ll be appointed?” “It is yet to be decided.” 

“谁会得到任命呢?”“还有待决定哩。”

A date for the meeting has yet to be determined. 

会议日期尚待确定。