IMO this team's depth has been the best it's been in recent years. You talk about no depth behind guys if you lose your cornerstone pieces, but any team would be pretty screwed if they lost their best player, or starting shortstop or catcher. I agree the Jays obviously need a backup catcher, but I'm sure the FO is aware of this as well. but McGuire or Jimenez are potential back-up options if Martin goes down. The rotation depth is pretty good, Bolsinger could probably be at least an average starter, Oberholtzer could make a serviceable swingman, and Biagini can start as well. The difference here is, the Jays have serviceable depth underneath the starting 5 that can do at least an average job instead of throwing s*** at the wall hoping something wouls stick as they've done in years' past.
The bottom line here is that injuries to your best players will screw almost any team over and the Jays are no exception, but their depth this year is vastly better than it's been than it was under AA. Plus I agree about the retooling, the Jays' core wasn't built to be sustainable, and most rational fans appreciate that, but unfortunately, most fans are not rational.