Even the worst MGS title imho is better then Splinter Cell. I like both series, but MGS has a massive edge.
I still think Ubisoft can really make Splinter Cell a great series again if not better then what it was prior....here me out folks before killing me lol
Wildlands is already in that MGSV ball park in terms of concept, open world, AI etc.
Put Sam in that type of thing with buddies that help him out like dropping him off to some area, add hitman elements like him blending in (or AC as that was a thing in that series too early on) . Have areas that are clearly legit kill zones like bases, but also have civilian type areas where he must blend in to kill, capture, save, collect etc. Give a day and night cycle and have the NPC behave as such and we could literally have the best selling Splinter Cell in history with a whole new generation to carry the legacy. I love the old Splinter Cell stuff, but it needs more depth, never mind just beating a level, what happens with Sam when runs to get the extraction point? Making it a massive open world allows for even getting to some LZ part of the fun as MGSV did a great job of this, it wasn't JUST about grab a person and mission complete.
Waiting for it to be dark is part of it
Putting C4 on the power generator to take out their power is part of it
Sabotaging the communications is part of it
grabbing the hostage during the chaos clearly is part of it
but over all, making it to the LZ to be extracted is part of it and adds so much.
This concept might work better for what Splinter Cell is more then even MGSV. Big Boss destabilizing entire regions might be a work of fiction, but The United States doing this is complete objective fact. It fits and Sam going after high valued targets or saving diplomats or making the choice to go against orders and saving little kids caught in the cross fire can help build a deep narrative in absence of Konami doing any major MGS.
We all talk shit about how Konami dropped the ball, but I question why Ubisoft didn't take advantage of that as they sold less then MGS, not more. This concept can work and it would be a day 1 for me as Splinter cell is still a solid series and I'd take Splinter Cell open world even with a new team, then anything Konami has for MGS outside of a just a remake or something. MGS might be the better series based on what it was prior, but Splinter Cell has a strong publisher with many teams to really make it have a massive comeback.
Also note that they don't even need to waste time with Sam Fisher lore, its already understood that if and when he dies one can and will take his place. Customizable Splinter Cell Agents can also work as that is part of the series that they are interchangeable and disposable lol I know there is a name for this type of wet work in government circles, but I don't recall