A few answer to yr questions:

1) there are still 45 Javelin 2 sailing in the US plus 3 in Canada. Therefore the North American fleet can match the Italian and Swiss fleets;

2) there is also a new, perhaps the most radical, 18HT design not mentioned so far: the French Tomcat 18HT (3 boats built so far);

3) the US 18HT class web site is still running (see www.f18htclass.com) but it was no more updated since a while;

I heard that BIMARE is planning to sell a few new and used Javelins 2, Little America's Cup version (under 130 Kg), in the US at a very interesting price through VectorworksMarine, which is already taking care of providing assistance/replacements parts to all US 18HT owner.