Its overly simplistic to say that we as a community need a 50/50 split between workers and learners in order to remain solvent.
many investors and workers at Lehman, Bear Stearns etc lost their jobs and savings.
many wealthy individuals and tzedakas who invested in the stock market in general lost millions. With Madoff many lost Billions.
When will we learn that parnassa is min hashamayim?
When we learn that we will never know if the Yissachars are helping the Zevuluns (by causing them to have siyata dishmaya and make more money) more than the Zevuluns are helping the Yissachars (by writing a check to a kollel or supporting their kollel kids)?
Yes, we must do our hishtadlus. Yes, in Europe there never was a kollel system as there is bli ayin horah today. But tremendous people like Rav Ahron Kotler ZTL created this revolution because they saw that this is what Klal Yisroel needed. When our Gedolim say that we have too many Yissachars and not enough Zevuluns then the system will need to be changed. Until then, the more kollel yungerleit there are, the better off we all are. Does that mean noone should go work? Of course not. Each person should get advice from his rebbe/rosh yeshiva on what is right for him.