Given the relatively fast turnaround rate that saw the debut of the original Paddington in 2014 and the release of the sequel in 2017 (which is fairly quick when we consider the effects work that these movies take), then it makes a certain degree of sense to know that King could want to put the character on the back-burner for the foreseeable future.
So it sounds like that adorable bear is going to have to wait a while for his next marmalade sandwich because no one is really sure if Paul King intends to come back for another Paddington movie.