We'd all like 20 year old Bert Blyleven to show up and throw 280 innings with a sub-3 ERA. But that's not happening.
In a general sense, I think the Twins have clearly decided that since they don't have and can't afford 200+ inning starters who can get people out the 3rd time through the order, they can get close to that level of run prevention from weaker starters if they just limit the exposure of those starters. Twice through the order and start looking for a convenient spot to take him out. It's actually been fairly successful.
However...the companion to fewer and fewer innings from starters HAS to be a stronger, deeper bullpen. There are no low leverage guys, no room for "long relief" which nobody uses any more anyway because if someone is good enough for 3 or 4 inning stretches they'd be in the rotation, and using up a pen spot on a guy who's only available every 4th or 5th day is hard to work around when you need 3 guys minimum every night. And just like shortening starts gives lesser starters a chance to keep runs down, 1 inning stints from your relievers is clearly the way to maximize their effectiveness. So that's what everyone does.
And again in general, I like that Baldelli generally takes starters out BEFORE they cough up a big inning rather than after (like Molitor was apt to do). In specifically this game, there is zero reason he should have asked for more from Archer. I'd argue he shouldn't have come out for the 4th, and wouldn't have if the pen wasn't so spent. In that sense Baldelli actually DID get an "extra inning" from Archer.