Ok so due to BU the size of blocks can be increased which will result in faster transaction confirmation and eventually less price so my question is (correct me if i am wrong) What's stopping some another stupid developer to create another fork in which he increases the supply of bicoin lol and majority of the nodes start accepting that? May be then all the hodlers will be doomed?
Well that guy will not get enough hashing power nor support in the community for the fork to be accepted.
Plus, nobody will be so stupid to accept that fork. Anyone can make a fork, even you and me can make one. but what matters is that if your fork gets the majority of bitcoin's total hashing power, and whether the community appreciates it.
So an answer to your question is no, HODLers won't be doomed because it'll never happen in the first place.