You do make a lot of valid points, however:
Your
Offensive Line is not very good... Smith has elevated his game significantly this year but is still very vulnerable to an amped up Greg Williams blitz package (He got sacked 44 times this season) because the Niners still don't protect him well. The Niners' running backs do a good job of moving laterally and turning the corner, making them difficult to predict & contain, but they're not really a classic power formation crew that depends heavily on run blocking from the OL. That's actually both a good and bad thing depending on situation. Personally, I'd rather have a power running game.
This is also not a short week as the Saints played on Saturday, so they're not missing out on a day this week.
Your time of possession argument doesn't really hold as the Saints and Niners avg TOP differs by 9 seconds per game. Ball control and a consistent running game are great, but the Saints are the #1 team in the NFL in 3rd down conversion by a substantial margin.
They keep drives alive.
And following that: In Special Teams, the NO punter, Morstead is one of the best in the NFL. His average is about 2.5 yards shorter than Andy Lee, and his numbers in most categories aren't among the leaders for the simple reason that New Orleans punted less than any other team in the NFL this year, only 47 times vs the Niners' 78. On Kickoffs, John Kasay converts about 65% (68/104) of his kicks to touchbacks, compared to Akers' roughly 50% (47/93). In returns, Sproles and Ginn are fairly comparable, however if you'll look deeper, you'll notice that kickers/punters often go out of their way to avoid kicking to Sproles. This is not by accident.
Finally, the SF defense is obviously great with the talent you listed above, but your pass rush is actually ranked 22nd in Sack % while the Saints OL is ranked #3 in pass protection and features 3 pro-bowler offensive linemen. Brees was only sacked 24 times this season in 657 pass attempts, so I think you're really overvaluing SF's chances of really disrupting him in the pocket.
I think this game is FAR from the easy win you're describing it as...