I agree to some extent but Jiraiya didn't exactly decline the title of Hokage because he didn't want to. He just said there was someone better for the job; that being Tsunade. If Tsunade hadn't been found then Jiraiya might have done it out for the sake of the villageI don't think you guys are getting the big picture.
Jiraiya was supposed to be the hokage after Hiruzen died but he chose not to, because he didn't want to.
So, if Tsunade hadn't of been Hokage what makes you think Jiraiya would be all of a sudden.
Shikaku or Kakashi may have been appointed.
Also, if Tsunade hadn't become Hokage than Sasuke and Kakashi would probably still be feeling the effects of Itachi's Tsukiyomi, just saying.