IMHO, you force your will on him, you risk losing him forever with respect to baseball. Since he is only a freshman, it feels to me like you are over reacting (by a lot) regardless of what some timeline says. Each kid will have to develop his own timeline. IMHO, I would back off and forgo spending the big money for now. Let him know that and say that if he reaquires his desire, that the financial support will be there for him at that time. Re-approach this discussion in the spring of his junior year as it might be clear to him what his passions are.
The love for baseball has to come from within. The funnest part of the game is playing it. Working at things is not as fun for many players. That is his call however and cannot be forced on him "for his own good" or otherwise. Do not let what other people post here dictate what is best for your son. Each kid is unique and may require a different plan than what is posted here.