People asking for a timeless version of the land - a la Fantasyland, where Gaston might bump into the Fairy Godmother, or Elsa, or Captain Hook - are forgetting that you can't really mix and match these characters up like they're background characters at the House of Mouse.
For a kid to bump into Vader after shaking Padme's hand, and then meeting Ray...
It's a diminished experience. You're now just shaking hands with cosplayers outside of Grauman's Chinese. Sure, it's all just people in costumes, but for the young nerd (and young nerd at heart) you don't want your peas to touch your carrots!!
They have a few options on the table:
1) Just add more timeless aliens and droids. Have Greedos, Protocol droids, and Bith walking around. It won't take much to increase that OT feeling without ruining the rest of the investment.
2) Dispense with the Batuu-as-Switzerland concept. Let the citizens proudly say "May the Force be with You!" instead of cowardly muttering "Til the Spires" as they nervously look over their shoulders for Stormtroopers. Savi's can still be an undercover operation, but find a spot for Jedi Training Academy (through which manifestations of Sith Lords from times past will appear), and just never have the Stormtroopers walk over there.
3) Ramping up that even more, change the storyline to you happen to be visiting Batuu on 'Legend's Day' where heroes of the past are celebrated - this would get you some festive decorations & music going on (Yub nub!) plus some steampunky Batuu-citizens-cosplaying-as-OT-characters! Whoa - that might be too meta...
4) OR, fine, set the whole thing in the OT. That will mean a lot of animatronic redressing / reprogramming in RotR, but it's doable. Hondo could still smuggle stuff with the Falcon, he'd just talk to Alden Erinriche on the big TVs instead of Chewie.
But don't do "timeless" Star Wars Land. That's just studio-park all over again.