“Staying in yeshiva” does not guarantee anyone’s hashkofos. What ultimately matters is what someone does while in yeshiva, and whether they are fulfilling the advice in Pirkei Avos, ??? ?? ??.
If someone “just gets by” in yeshiva, the environment has limited impact on him, and this bochur allows himself to be impressed by anything he chooses. While this can be the hadracha of the yeshiva and its hanhala, it can also be the exposure to anything and everything else. If we fail to ignite the passion for Avodas Hashem in favor of the academic achievements in learning, we can easily lose such talmidim to the enticements and attractions of the outside world. It is incumbent on all mechanchim of all levels to address that pintele in each and every talmid so that they will progress in their appropriate track of Avodas Hashem (???? ???? ?? ?? ????). We can then be zocheh to retain these talmidim as ????? ???”?, regardless of where they spend their time, in yeshiva or the working world.