It seems to be like it was some weird ass marketing strategy saying lets keep the current MM fresh and alive. To me this is like their "oh shit, we messed up bad, we need the OGs back". I can't be the only one thinking this >.<
They mucked up real bad and at last they are prepared to admit it even is this is a desperation move. I hope they have not left it to late.
My logic for this is based on a simple decline in sales over the years and merchandise sales are plummeted as well. I've seen many of the figures and this sums it up back in 2006 on average Risa Niigaki was is the bottom two sellers in Morning Musume. However if she had those sales today she would be the highest seller in Morning Musume for merchandise. This really shows how much they have dropped off each year. Hopefully this move will help both groups. They also need more shows and desperatly need stuff like hello morning back.