I’m not so sure that there are, percentage-wise of worldwide Jewry, less people in Kollel today than in pre-haskala Europe. There was less non-religious Jews pre-haskala. The non-religious today represent an overwhelming majority of Jewry and when you take them into account along with religious Jewry that are not in Kollel, kollel people are a small percentage of Jewry. So to call the tiny percentage of Jews in kollel as “mass Kollel” is inaccurate.
Besides, who is anyone here to say that whatever the percentage of kollel people are of Jews, that it is “too many” today???