Im probably a glutton for punishment responding to this thread because I'll probably get berated by the "BF til 6 months and food is evil til this point" mums, however I will because I believe strongly in doing whats best for your child and that individual mothers know best what is best for their baby and I can completely understand your worries as I had exactly the same thing with James.
He has been on extra hungry aptimil from when i stopped BF at about 4 weeks and like your little one, would happily consume a full bottle every couple of hours. At 12 weeks, with the consensus of my doctor, I gave him some baby rice with his final feed and started the weaning process from there.
He is 6 months next week and currently has 3 bottles a day plus his weetabix and homemade meal for lunch followed by a pud of some description.
He is such a happy healthy boy and I feel that I did exactly the right thing for him because he was pretty miserable before I weaned him.
Now he goes 4 hours between each feed and is content happy and healthy!
I would say if you have the sort of baby where you can follow the ideal of BF til 6 months then do the whole baby led weaning thing your very fortunate. Dont put your babies health and happiness at risk because you feel underpressure to follow the "ideal" guidelines. Your his mummy, do what YOU think is best.