Everyone has to do karma yoga since that is prerequisite for jnaana yoga. Karma yoga prepares the mind for jnaana yoga. Jnaana yoga only liberates the person.

na karmaNaamanaarambhaat naiskharmyam purusho2shnute|
na ca sanyaasanaat eva siddhim samadhi gacchati|

      Essentially without karmayoga one cannot gain the requisite qualifications for jnaana yoga. By just giving up karma one cannot attain the equanimity of the mind. In addition, no one can ever remain a moment without performing an action – He will be propelled to act because of his vaasanas.

Na hi kaschit kshaNamapi jaatu tushhTasya karma kRit|
kaaryate hyavashhaH karma sarvaH prakRitijaiH guNaiH||

    When to give up Karma yoga that is when one becomes yogaarudhaH that is when one is able to contemplate single pointedly in the direction specified by the scriptures. yogaaruuDhasya tasaiva shamaH kaaraNamuchyate| and who is yogaaruuDaH? – sarva sankalpa sanyaasi yogaaruuDha stadocyate|| 
the one who has no more interest in the sense pleasures, or in performing any action, and who likes to withdraw from all non-essential activities, he is said to be yogaruuDhaH|