http://babywhispererforums.com/index.php?topic=67569.0At 8 months 24oz of milk per day is plenty (20 oz inclusive of solids dairy is guidance).
One thing to keep in mind is that dairy solids don't have the added vitamins that formula has (breast fed babies are advised to have vitamin drops from 6 months in the UK), this would mean that if the formula intake dropped considerably to be replaced with dairy solids LO wouldn't get those vitamins.
Another thing would be that if LO is mainly getting milk plus diary solids she might be too full to explore a wider range of solids which could hinder vitamin intake (and a development of tastes for wide variety of foods) but if you're happy with the rest of her solids then I don't think there is any problem at all.
If you saw a persistent reluctance to try other foods I'd look at reducing either milk or the cheese/yogurt.
Happy, I found it impossible to get sugar free small pots of yogurt, a small washable jar or plastic pot to decant the large tub stuff into to take out and about might be useful. Turned out DS can't take yogurt, it flares his reflux, so it was a short lived problem for me.