"Safest" Canadian blue chips?
FTS comes to my mind, having the longest history of increasing dividends.
Banks... unlikely to go bankrupt... but not impossible. You're not *likely* to use cryptocurrencies to buy houses. And presumably the banks will just buy up whatever threat comes their way.
Telecoms? Been around a while, and now own a lot more (they are combined media companies... I'd maybe be more sure with BCE if I could just buy the 'utility' bit honestly). Vulnerable to changing content consumption? I can't see a world without the need for infrastructure, though, so I'm assuming BCE will be around for quite a while.
Oil - Suncor - clearly profitable and very able to control their costs.
ENB - oil and gas have got to get from the fields to the refineries to our houses, right?
Any other suggestions? Assuming human life is still here and living in houses and condos (not necessarily driving cars), which companies will (almost) certainly still be here... in 2100?