There are a lot of questions that factor into this but the most important being - Has your son been in contact with any schools or is he looking to establish contact now? If none, you're going to have to give some background info on your son and what type of schools he is interested in.
Your son's travel team not going to the WWBA is already giving me an idea of the situation. But Triple Crown (at least in the tri-state area) is pretty weak in terms of competition and being useful for recruiting. I have my opinions on Diamond Nation, but all I will say is that it's just the venue. The colleges in attendance are there based on connections they have with travel coaches, and because kids (they are interested in) email them and let them know they're playing there. They don't just show up because DN is hosting a tournament.