fed ben fed – lets first start conceptually. if you believe that jewish education is a right then that means it should be readily accessible to everyone. if you believe that it is a privilege, like say, college education is, then if you can afford it you get it and if you cannot you do not. (also see the rambam, hilchos talmud torah, who places the obligation upon the entire community).
lets now talk chomer – i wholeheartedly agree that we should be pushing advanced degrees etc etc but practically speaking, if a person is paying 4 yeshiva tuitions, he needs to earn $70,000 or so just to cover those expenses. It is unreasonable to expect growing families to commit that much earning power to cover education. even with advanced degrees we cant expect such a thing. and when will they save for the future? and when will they buy a house? (in fact, i suspect the great hesitation we see from some sectors in joining the work force is the realization that even if they work hard they will never be able to come close to cover expenses – with tuition being a great burden).
alternatively, we can expect frum families to limit themselves to 2 children spread many years apart. not a choice that hashem will want.
instead, if people pay a yeshiva tax the way they do property/school tax or the way the archdiocese does it, it will place the responsibility upon the community (the way it is done among chassidic communities, the catholic school system, the public school system).
patri: we are headed to centralized billing one way or another. it sounds impractical now but it will be the way your grandkids pay tuition. i see it maybe evolving as follows: a large endowment will be established to support paying tuition. schools will want to get some of that money. people will want to apply for that money. the larger it gets the more muscle it will have in dictating to the jewish community what it needs to do in order to be eligible. shuls add a yeshiva tax upon their high holiday seats, or something of that nature. of course there will be many that will be exempt from such a tax; the elderly living on a fixed income, for example.