I expect Biggio/Espinal to share either 3B or 2B and Smith/Lopez/Groshans to fight it out for 3B if no trades/free agent signed. We'll see.
Of course, there is always the option of signing one of the big free agent shortstops and putting them at 3B or 2B ala Semien last year. But that is a bit too much speculation for now - wait until February for that. If any of those guys are still hanging around the Jays might then grab one again. Guys like
Trevor Story (73 games at 3B in minors, 29 at 2B),
Corey Seager (6 games at 3B in majors, 20 in minors),
Carlos Correa (never a game anywhere but SS), and others. I see Story as the most likely to not find an adequate contract due to his 'meh' year this year (103 OPS+) and the Colorado factor.