I just finished another re-watch and the last episode got me thinking. So let's just assume Tony is killed. Who takes over as the Boss now?
		
		
	 
If Tony Soprano was killed in that restaurant, then it means the hit was ordered by Butchie DeConcini, the de facto head of the Lupertazzi family after Phil Leotardo was executed. A hit on a head of a NY family can't go unanswered. That's the point plotwise that makes little sense, as Tony being relatively smart about tactics, would see that in order to pull off a hit on Leotardo and survive, would need a fall guy other than himself.
Any new DiMeo family boss would need to be acceptable to NY and the Lupertazzi family.
The remaining ranking long time caporegime in NJ is Larry Barese, who would be made boss, and because he was in prison, his brother, Albert Barese, defacto capo of the largest surviving crew and the defacto largest earning crew that survived to the end, would be street boss.
Patsy Parisi's son would be marrying Meadow Soprano, so NY would see that as too close to elevate him, even though Tony had Patsy's twin brother killed. Also Patsy was a soldier in Tony's old crew under Paulie. NY would want someone without any lingering association that close to Tony or Paulie
Paulie Walnuts only had Barone Sanitation left as his money making machine. He wasn't a good earner and he wasn't respected without Tony behind him. He survived because he was loyal and served under Tony's father and Tony spent the entire show basically protecting him from himself. NY would never allow him to become boss with his temper and limitations
Silvio Dante, if he survived the hospital after the shooting, would be forced into retirement like Uncle Pat. He was seen as too loyal to Tony and NY would want no further bloodshed to trigger more violence. Silvio was not the family muscle so NY would not be threatened by him in a weakened state.
Albert Barese is the right choice for NY. He showed contempt for Tony throughout the show but stayed in the background to protect his older brother, not wanting to rock the boat. He knew Tony and the others were a mess and just stayed out of it. He wouldn't respect Paulie nor Patsy nor a weakened Silvio and wouldn't have to with the largest crew and the remaining biggest earners. He's just smart enough to know he's not smart enough to overreach with his ego and go on a power trip.