Surely there's a conflict of interest between being a MP and the many positions that he now holds. Unbelievable if he isn't made to resign as an MP over this. The Tory party is actually such a shambles at the moment, with an unbelievably shit week for them, not that the polls reflect this.
This move from Osborne is clear though, he's prepping support for a move of his after 2020 back into mainstream politics. I'm not sure if his future is leading the Conservative party or a new centre party, either way his intentions are pretty clear.