I actually think most responses were positive, apart from the ones trying to make the OP see that she needs her husbands support.Wow... I'm really sorry, OP, that you aren't getting some more positive responses.
I began home schooling our children because I really don't like the way the education system works. Unfortunately, due to the fact that I am time poor and our home schooling was more like unschooling (I don't have anything against unschooling, it just wasn't what I wanted for our children), I enrolled our girls at the local primary school, because I felt they weren't functioning at their full potential.
Home schooling takes a lot of commitment and from what I've observed from other home schooling families I know, they spend a lot of time attending "extra curricular" activities (music classes, art classes, etc) to make sure they are covering all the curriculum. I think all the families I know also have difficulties at times with getting their children to do school work.
I disagree with the argument that teachers spend 4 years at uni, so how can an untrained person possibly teach their children. I am a trained teacher and I will say that my 4 years of university training were largely useless. When I entered a classroom for the first time, I was completely unprepared. There is nothing particularly "special" about being a teacher.
Also, the argument that children need to go to school to be "socialised" is rubbish, in my opinion. Unless you plan on keeping your children prisoners in your home and not allowing them contact with anyone outside your immediate family, they will mix with plenty of people of different ages and backgrounds in different situations, and if that isn't socialisation, I don't know what is.
I do agree with other posters, though, that it would be helpful if your husband was on board. I would continue to talk to him about it and encourage him to learn about it before he made a decision.
In regards to prospects after highschool, if that is an issue for you, I'd work backwards -- contact some universities/tafes and find out what requirements there would be for home schooled applicants. Again, I don't believe (myopinion and my experience) home schooling does not limit prospects.
I have probably waffled on long enough. In summary, all the issues your husband has highlighted, in my opinion, are not issues at all. If I had more time and resources to do it properly, I'd home school my kids again in a heart beat. (There is rarely a week that goes by that I'm not growling about some aspect of school or the education system.) We are off to highschool at about the same time as you, and I too am considering home schooling as an option again.
I, for one on this forum, can see the benefits of homeschooling and if it's something you think you and your children can handle, then I say go for it -- just try to get your hubby on side first.