I think the idea that people should be supported in learning is part of the problem. In the alter heim, there were very few people who learned full time with no parnassah. In the gemara every amora had a job.
This model of a kollel society is not sustainable and I think that is part of the underlying shidduch "crisis".
Woah. Support for your comments? Every amorah worked? This argument is age-old, the taanaim argued about the proper way to go about learning and living, and people far greater than you and I have discussed this topic, our input is meaningless as to what is "right." Bringing proof from earlier generations where people who made a living at the same time as learning is ridiculous, unless you mean we should be like the Rambam's "Baal habas" who learned 9 hours a day. Nowadays it's hard enough to be properly holding in learning as a full time yeshiva bochur, let alone working.
The kollel lifestyle isn't meant for everyone. It requires a full-on commitment regardless of support, but when done properly, this is what am yisrael survives on through the generations.
When a family decides to support children in learning it's a beautiful thing as they are showing they appreciate the true importance of learning by supporting the children who are fully capable of using the support to its fullest and fulfilling their potentials as best as they can, in the best possible way-sitting in learning.
If it's not financially possible, then there's nothing to speak about. Everyone has to do the best with what they're given, but they also have to do their best to sacrifice for causes they believe in.