Ok here goes. Being in a band is about playing the music you love. Do we all agree? Wouldn't it be great if we could earn money from this thing we love?
The people in your band are VERY important. You have to have people who are good at what they do. Are creative. And dedicated. And enthusiastic. Also you have to get on with them.
Now, if you are just messing about and don't intend to gig then keep the people who are in your band now. If you want to record a demo do some gigs and maybe get a deal then kick them out. Make no bones about it. Just tell them straight. It may hurt but its the way its gotta be.
People love the idea of being a rock star. Then they realise its actually very hard work. Learning your instrument is such a begining thing that if they can't be bothered to do that then they have NONE of the qualitys I have talked about.
It really sucks when they are your friends. It can hurt the friendship. But if you want to succeed then its just the way it has to be.
I hope this helps...