I want to see it, and not for the reason of having 6 members in the conference for an automatic bid to the NCAA tournament. Presently today with the addition of Louisville, the ACC will have 5 teams playing men's lacrosse and 8 playing women's. Boston College and Virginia Tech play Women's lacrosse along with Louisville. These are the three most likely schools to add men's lacrosse in the ACC because they already have women's. You mentioned Louisville. There are rumblings at Boston College as well because Boston University has added men's lacrosse. BC does not want to take a back seat to BU. Here's a link about this:
http://www.bcheights.com/alumni-call-for-the-return-of-varsity-lacrosse-1.2965747
The reasons I want Johns Hopkins are some of your other points. It would restore some ACC presence in Maryland even as slight as it is. That will help with the ACC Network in Maryland. JHU is a strong Lacrosse Brand, and it will help with content on the network. Their current ESPN affiliation is also a plus. In addition, the academic association adds another top 20 academic institution to the already strong ACC collection of schools. And finally, UVA, UNC, Duke, and Syracuse already have a history of playing JHU in lacrosse on a regular basis for many years. We all already have them on the schedule regularly. All this would mean would be allowing JHU to participate in the ACC Lacrosse Tournament. I don't want to see them drop us to go play Ohio State and Michigan. I really don't want that even though the ACC regular season schedule will be brutal as it is. I wouldn't think that the ACC would want the Big Ten further entrenching itself in what we consider ACC territory.
One thing I'd like clarity with though is that it looks like they only want to bring in Men's LAX. I would also like them to bring Women's LAX too.