Pillar for Yelich seems interesting but unlikely to see Yelich traded (see below). Jays would probably have to include a good prospect to get this one done. Would giving them Pillar and Urena be too much for Yelich? Not sure how Urena might fit in the Jays future plans with Warmouth and Bichette as other possibilities at SS.
I agree with the thinking, BUT on Monday the report from an interview of Marlins president said they were looking to retain Yelich, Ozuna, and Realmuto.
https://www.mlbtraderumors.com/2017/07/marlins-trade-rumors-stanton-yelich-ozuna.html
Probably, this means it won't be easy to swing a trade for Yelich without giving them top prospects, or as you say, taking on a bunch of "Miami's trash". Probably, Gordon shouldn't be put in the trash category (on pace for ~ 3 fWAR). I wouldn't want to take on 2-3 bad contracts to add to those of Tulo and Morales, and to a lesser extent Martin, just to get one good player unless Rogers is willing to go to $200M payroll. In that case maybe going with free agents for the short term may be better.
Yes with a team that has a chance to contend if things fall into place while having financial commitment from ownership to plug the holes with veterans until the young guys are ready to step in, there is no reason the Jays need to tank rather than a Red Sox / Yankees type retool.