This does not work for me, on many levels.
It has absolutely zero appeal for Aso, as it seriously compromises his own dream of becoming Prime Minister. Being Secretary General would leave him responsible for keeping the party on message in support of Prime Minister Abe's policies. Corralling the restive party rank-and-file will be a thankless task for the foreseeable future.
Aso would also have to really work, meaning he would have cut down on the time he consecrates to reading his beloved manga.
He would be in charge of leading the LDP to an inevitable loss of its supermajority in the next House of Representatives election, whenever that may be--which is not exactly the best "last major achievement" in the resume of the person who wants to succeed Abe.
Finally, is Mr. "Alzheimer's Patients Could Understand It" really that popular with the public? An Aso face off against Kan Naoto or even Fukushima Mizuho on one of the Sunday shows does not say to me, "Yowza, boffo ratings!"
So am I suggesting that Yomiuri, the house organ of the Abe Cabinet, is jumping the gun or trying to create a fait accompli?