If Future party does fold into the DPJ then at least this is part of the consolidation of the center-left which is needed for DPJ to survive. What is also key is revival of an alliance with SDP. This way a viable alternative can be formed once the JRP starts falling apart which I suspect it will.
It's depressing to think that the DPJ will continue to be the main party of the Japanese center-left, such as it is, but I suppose this is better than most possible alternatives.
I suppose Kaieda will let Ozawa return to the DPJ not much the worse for wear if Ozawa wants to. It's a shame. Ozawa's new 'Life Party' outfit is his fourth party in six months, and eighth in his political career. He jacked Governor Kada for all the political capital she could conceivably have had (or acquired) in what I think was a really reprehensible and abject manner.