I think that Ganga will accept Rahul's proposal because
if Kaveri or Rahul find out the truth then they will work towards Ganga and Sagar marrying eachother provided they don't become selfish all of a sudden.
Subodh will definately be helpful.
In both the cases the serial will end cause'All is well that ends well.'
But I don't think the creatives wuld like to end the serial so soon.So I think tht Ganga will have to accept Rahul's proposal.
As far as Puttan and Kanchanji r concerned they will never reveal SaGa luv secret cause they want Ganga out of the house,to phir woh apne hi per pur kulhari kyon marenge?