Would you organize the Blades without Esbern and Delphine if you could? What would the Blades' new purpose be? Would they still be a network of highly effective warriors and scholars who traded information and collected knowledge (in much the same way that the Thalmor do, btw) and advised the rulers they protected? Would you repurpose them somehow that was better suited to modern Skyrim and the weakened Empire?
Is it time to make your bid for the highest throne in the Empire, Dovahkiin? No one has more of the dragonblood than you have, regardless of how careful the Emperor thinks his bloodline has been traced back.
Now that Alduin is put down do you believe that you are still Skyrim's protector or is she now on her own?
If the Dovahkiin is here to protect Skyrim, what are you going to do? Who is her next greatest enemy?
If you believe you're not here to protect Skyrim then what are you doing now that you're retired?
I'd personally put the Blades back together from some of the cleverest and sneakiest friends I've made in Skyrim and I'd put Esbern and Delphine on warning that I'll be back to Sky Haven and it wont be to make nice or with Paarthurnax's head in a bag. They work for me or they leave. I would bring the Blades back in support of either the Emperor or Ulfric (either side makes the same commitment from me, as the Dragonborn who does not wish to be Emperor) and we would be the guardians of the independent interests of the countries that make up the Empire so that every country has a level of communication and protection from an Empire that would give parts of countries away to the Thalmor to "make peace" and would sell away one of our gods, the one the Emperor is supposed to be descended from, in fact, to please our enemies. I do believe that the Empire and the lazy ineffective government that it represents has become the greatest enemy of the peoples of the Empire in the face of the continuing threat posed by the Aldmeri Dominion. It's time they looked over their shoulders once in awhile and time they started waking up in prisons where they were being tortured for information and tortured for possible information.
Here's a spot to go about inspiring the rest of us... what next for you and how would you do it?


So basically I was forced to either break the main quest or join the legion.
When the Thalmor are brought to heel then the Empire would be back to its glory days ...
), but from what I've read the Blades would have to undergo a major overhaul. 
which links her to the Thalmor while she is also intertwined with the TG.
). I'd say 99.5% of the NPCs are marryable; however some are straight, some are homosixual (male and female) and some are bi-sixual, but in the big picture almost all are marryable.