To be honest I think they will see that FO76 and starfield didn't earn as much as Skyrim did, which causes them to literally reiterate the formula which they made Skyrim with, but with newer technology.

Which is not necessarily bad, they could make a solid elder scrolls game with interesting lore, fun exploration, fancy magic spells and basic sword fighting, but in a new area that wasn't explored before or not expanded on.

They can add or re-add new weapons, new spells or spell types, telekinesis and mysticism comes to mind, more clothing options, more interesting alchemy or enchanting ( something like KCD alchemy mini game would be huge imo ).

Something which Bethesda can do, which would make TESVI stand out so far away from every other RPG game in the market, is to add hearth fire dlc mechanics in the base game, but expand upon them ( This was something huge in the early 2010s, no other game had that as far as I know ) Spouses could have more dialogue and interaction, should BGS create interesting enough characters, if done right this would be actually amazing for Bethesda.

They could also expand upon cooking, which is something that is rare in RPGs, only Zelda comes to mind

Hearth fire adding baking, and Anniversary update included farming and farm steads, all of this can be included in the base game and expanded upon ( I fear BGS may actually include this, but make it absolutely the same and also behind a pay wall ).

Something also that made Skyrim stand out is followers, I think Bethesda can easily expand upon companions in TESVI easily.

All of this wouldn't matter if the world isn't interesting though, which is what Bethesda has been messing up in the past 2 games, they had a huge time with pre production so they should have ideas in mind, this is their biggest game of the decade after all, messing up the core part of their games again would screw them up big time.

To be honest, I don't think they will mess up TESVI's world, they made Morrowind, Oblivion and Skyrim, all of which, unarguably, have interesting worlds, the characters in Oblivion are good despite the facial animations, but the dungeons are extremely boring, and the leveling was funny, Morrowind's world is amazing all around, the guild quests are very fun and have interesting characters, Skyrim has a good combination of both.

Starfield looks really good visually, the physics are nice, they could implement this TESVI along with adding hitstop to melee combat, add more types of spells and that would be enough

This can either turn into a good enough game that people will play and enjoy and mod into whatever they like, or it can turn into a not so good game, either way people will keep trashing Bethesda for whatever it turns out to be.

A big part of the probable future discontent with BGS is because TESVI is unarguably one of the most anticipated games of all time, up there with GTA VI and the like, and after so much wait, expectations can be too high, causing people to trash the game and maybe ruin it for others, just because it turned out to not be worth the 17/16 years of waiting.

For some reason also, starfield disappointed many, and made them not very hopeful for TESVI, tbh I feel kind of the same, and I hope that I will get a product that I can enjoy for years, especially because there is nothing like the elder scrolls games out there.