600kilo, that is a pretty good idea. It stills allows the kollel route without putting a strain on parents. The wife can generally support a family on her salary when its just her and her husband. Even if she has a child right away, the costs are not all that expensive if you are careful.
I would prefer to at least see a 50/50 split between learning half the day and then getting training/degree the other half. That would allow the man a money earning career after his stint in kollel.