Premise:
"The beach of Canical now looks rather forlorn, with rotting hulks and flotsam and jetsam testifying to better days."
Hypothesis: The beach of Canical is situated too far away from the city center to attract visitors.

it is not possible to tell

Premise:
"well i'm sure that's still going to happen"
Hypothesis: I am sure there is nothing preventing that from happening.

it is not possible to tell

Premise:
"A little further southwest are some second century a.d. catacombs with tomb chambers painted to depict Greco-Egyptian themes."
Hypothesis: Southwest you will encounter catacombs and painted tomb chambers.
yes