Those using some form of resin infusion and those who are going to use some sort of resin infusion soon. If Nacra or anyone else making boats has begun using infusion, then they still are. No way they would go back. Better to work out the bugs (if there are any). This is how boats will be built from now on.
IIRC the way US laws are going at present with respect to emissions and staff exposure to chemicals and fumes, in a few years you won't have any choice but to infuse if you want to build composite boats in the US.
I understand that a large part of the reasoning behind the proposed law (I think they put a guidline year date in the law) is environment and worker health....this is likely a stupid question, but where do the fumes go if you are resin infusing?
