Wizardry 6 was not that linear.
Apart from the starting castle area Wiz 6 was highly linear. Castle > Mountains > Mines > Pyramid > Isle of the Damned > Swamp etc. Most of the retreading was done in the first third of the game.
Wiz 7 allowed you the freedom to explore in a less linear fashion but again, eventually you ended up on a more defined path due to the difficulty of monsters in some areas. Wiz 7 was probably a good example of a game that gave an open world vibe though. As for Wiz 8, I really need to give it another go as I didn't get into it as much.
Just because the Wiz series gave more freedom to save (even if you had to fudge a multiple save system) I wouldn't want it in a Bards Tale game. Suspend anywhere, sure - but if you die after an hour exploring a dungeon because you've bitten off more than you can chew then reloading is frankly pathetic. Blobbers are about expeditions into the unknown, and part of being a skilled adventurer is knowing when it's time to get the hell out of Dodge.