Also the Jays should re-sign Smoak to play 1B for the next few years. Tellez could push him out if he learns to hit MLB pitching, but Rowdy is not good enough that you have to clear a path for him.
Smoak is actually having his best year in many ways, but has an insanely low .230 BABIP despite having a higher percentage of line drives and hard hit balls than he did in 2017 or 2018. His xwOBA is .380, 27th highest in baseball. Even though he's not going to be a big BABIP guy because he is molasses slow, this year has been extremely unlucky. He will also almost certainly come cheap. Basically, he's EE-light, both in terms of performance and cost. I bet they could sign him to another 2/8.5 deal. Easily worth it.
While I'm not totally opposed to signing Smoak, doesn't doing that have the exact opposite affect of what you said in the post above, using the DH as a load management spot?
Now, if you cut bait with Rowdy, then you do need someone playing 1b, so I definitely don't mind a guy like Smoak for that spot. But I do think keeping the DH spot open so that you can routinely rotate in Guerrero, Bichette, Gurriel, Biggio, Hernandez, etc... like one day a week each, while bringing in a vet like a Sogard or Galvis to fill in around the infield only makes sense. Or if you want to use the DH spot mostly to rotate the OF, with Alford out of options next year I think you might see the team carry 5 OF, in which case you basically need to run one of them at DH more often than not.
Now, I mean, Tellez has been kind of brutal this year, but he's crushed minor league pitching at every level, so give where we are, I'd like to give him another chance next year. So your roster next year is basically:
Jansen
Tellez
Biggio
Bichette
Guerrero Jr
Gurriel
Fisher
Grichuk
with McGuire/Drury/Alford/Hernandez/McKinney as DH/Bench options. There's not really anyone else knocking down the door, so you could swap someone out and bring back Smoak if you want him as a vet option, but I don't think I'd give him more than 1 year, and it would be more of a "hope he has a strong first half so you can get something at the deadline for him" type of deal rather than anything else. He's also a slow 1B-only, so even if he has a strong start, I doubt you get much of anything for him anyways at the deadline.