Both Hernandez & Buckner have been infamous in the majors for going on 20 years. Like I said, what do ya gotta do to get fired.
@skeeter In Brian Runge's case, he was fired in 2013---for failing multiple drug tests.
In the case of Marty Springstead, Rich Garcia, and Jim McKean, longtime umps who became ump supervisors,
it took a phalanx of blown calls in the 2009 postseason to put their heads on plates. (There were numerous
blown calls in the American League's division series and ALCS that fall---and one of the umps who blew calls
was, what do you know, C.B. Bucknor.)
In Al Clark's case, he got sent to the guillotine in 2001 when MLB discovered he was abusing his major league
credit card in the wake of an earlier case in which he'd been caught in a memorabilia scam involving David
Wells's perfect game.
In the sad case of Dave Pallone, then-commissioner A. Bartlett Giamatti eased him out fearing the ump
wouldn't be able to handle the pressure if his homosexuality became public knowledge. (Pallone eventually
wrote his own memoir.)
In the strange case of Al Salerno and Bill Valentine, then-American League president Joe Cronin canned
both after they worked the crew in a Cleveland Indians series in 1968---with Cronin saying only that they were
"bad umpires," but Salerno and Valentine claiming the real reason was their effort to organise AL umpires
into a union. It was the only time Cronin ever fired umpires during his tenure as AL president. And, in fact,
the Salerno/Valentine firings
did lead to the formation of the old Major League Umpires' Association:
the National League's umpires voted to admit the AL arbiters into their little unit and thus was the MLUA
born. The further bad news: the National Labour Relations Board eventually ruled that Salerno and
Valentine hadn't proven they were fired over union organising. Valentine had a happy afterlife as the
GM of the minor league Arkansas Travelers; Salerno suffered multiple heart attacks, a bitter divorce,
and sporadic employment after his umpiring days ended, all because he fought the firing to the end of
his life, dying in 2007.