I like it as it looks much more modern I think it would help sell more copies of BIAB too

You need to convince more of the younger crowd as older users are already fans and probably don't really care that much about a redesigned website. However for the future of the software a younger crowd need to be encouraged too without alienating the faithful of course.

Young people are used to the idea of appearance trumping content. If software (which might be amazing) looks dull they'll probably go for something that looks cooler even if it might be fairly useless.

The younger crowd have been brought up expecting certain design standards whereas maybe the older crowd are looking closer at functionality. I am generalising but I think there is a basic truth in this.