No one can change and replace bitcoin, because bitcoin is the future of cryptocurrency.
Bitcoin will stay the King for many years, but later, the new, almost perfect cryptocurrency can replace it. I guess, none of the existing now altcoins can ever do it. They will be always following their leader.
Exactly, I also haven't found any other type of coin that can replace Bitcoin until now and can make a big change for everyone who is sad with the decline experienced by Bitcoin. if that is indeed you, maybe Bitcoin will experience a decline in interest.