The BBC is wilfully determined to follow its own bizarre path, in spite of listeners voting against it by deserting in their droves, to Greatest Hits Radio and Boom Radio.
The simple fact is, there was nothing wrong with the Radio 2 lineup as it was, but 'managers' can never simply leave things alone, otherwise they get awkward questions about what they do all day.
So they have to change things around.
Replacing Steve Wright with Scott Mills meant that they had to offer something 'different' to justify the change, so Mills plays a far higher proportion of dance music and later decade songs, and people switch off and go elsewhere.
The BBC had form - they lost Simon Mayo after their 'diversity' garbage gave him an unwanted and unloved Jo Whiley, and now they are losing other presenters as the station sinks in a swamp of its own stupidity and pig-headedness.