As the flip side to Fenway and in response to #1 Assistant Coach - My son went to HF as a rising senior. For a few weeks leading up to HF we were working out final details with an Ivy (that is- whether to be an ED with support or shoot for the Likely Letter - the pre-read had come back very positive). In Sons mind he was committed to the Ivy.
Son went to HF anyway as we had already paid and he wanted to talk to some Patriot League schools just in case something fell through. While at HF he met many D3 coaches, from schools he had never considered, and in some cases, never heard of. After overnight visits to some of these schools he picked D3 over D1. In the end he had an amazing college baseball experience and great success at an institution that he will argue is better, and certainly more rigorous than the Ivy he didn't go to. My point is that things change quickly in this business, and your kid is more mature than you might think.
Remember, D3 money is better than athletic money in that it is a result of admission (which the coach helps you secure) and not tied specifically to baseball, making it "guaranteed" for all 4 years.