The problem with this in Israel is the way the system is set up. It only works in such a way that one need to use Torah to make money--or he can't be learning at all. That is the whole system is set up in such a way as to make only Torah not for its own sake possible. Not Torah for its own sake.
The USA has at least in NY where the system is set up as to make Torah for its own sake possible. But in Israel the only place that seems to work is in Bnei Brak in Ponovitch.
Just one example would be the idea of taking tests to show you did the learning in order to get the paycheck. An open violation of the prohibition of learning Torah to make money.
To me it seems the only way to learn Torah for its own sake in Israel is to do it own one's own time and expensive. And in some way that is probably a good thing because the religious community there is anyway pretty messed up. The leaders tend to be demons in human form and their vicious anti Israel agenda just goes to show it.
The general path that was accepted in the Mir and also in Shar Yashuv was that Torah should be learned without any intention of using it for money. As for a vocation, the general advice was to go and learn a trade or go to university. How it got to be accepted to use Torah to make money as the entire religious world does today is a complete mystery to me. I thought that everyone knew that Torah should not be used to make money or to be asking for donations. It is not just that it is in Pirkei Avot. It is something I thought was common knowledge. But hanging out in the religious world I found out that using Torah for money seems to be perfectly acceptable nowadays.--even admirable.
And in terms of kollel which comes under the category of accepting money to learn Torah--if it is done in that way then it is OK to Rav Joseph Karo the author of the Shulchan Aruch, but that is not how it is done nowadays.