obi wan definitely should be on the council....anakin i'm not so sure about....the whole point of the dialogue in the anh duel revolved around anakin's jealousy over obi wan having a higher rank in the jedi order, when he clearly viewed himself to be superior....anakin on the council kinda makes a mockery of this....
the thing is, when you imagine lucas sitting down and deciding to include this in the script you realise that there had to have been some point in writing it in, either from a dramatic viewpoint, or something that it adds to the plot....these things don't just happen by accident, without a lot of thought and consideration.....
i was at a loss when i pondered the question here a week or so ago, and this is the best i've managed to come up with in the meantime....
it would give anakin a reason to become more arrogant and cocky, and feel he has the right to challenge obi wan in any argument, it partially explains his feelings of respect and attachment to palpatine in the ot, and it also would add to obi wan's frustration with anakin....as noble a man as he is, it would have to rankle at least a little, seeing that immature little upstart on the council after relatively few years experience....no doubt anakin will also brag his arse off.....