Hard to say. Yes, rookies have a learning curve, but we saw last year how two rookies can transform an offense. While that's not the norm, it's definitely the case that rookies come in and improve teams all over the NFL in any given season.
Along the defensive front 7, we've added Taco, Tapper, and Jaylon, and Paea. And lost J. Crawford and McClain. That probably works out to be a moderate upgrade.
Elliott's contract wasn't all that cheap, since he was the #4 pick overall. And we're still carrying Tony's big deal, so that window you (and I) are both looking forward to isn't really open just yet.
Finally, we do have a young team at most positions. It's reasonable to believe players are going to improve with reps and time working together. That includes guys like Dak and Elliott, but also the backup guys who only get snaps in limited position groups and on STs. That stuff matters, though. And the rookies who are playing key roles will start out rookies, but will be getting better and more comfortable as the year wears one. What we'll probably see if those picks pan out is more uneven play early, offset by improvement over last year's status quo as the season wears on.
I expect this year's team to be better than last years by the time the end of the season rolls around. Barring significant injuries, of course. I'm not expecting to go 13-3 again, though.