The province wouldn't go for it. They wouldn't even call an early election when Ford was stripped of his powers. They like the municipal elections all at the same time.
Plus, the elections act doesn't give a shit about who you are or your health. There are like 50 people running for mayor right now. Ford isn't special.
Some relevant references:
Death or ineligibility of candidate
39. If a certified candidate for an office, before the close of voting on voting day, dies or becomes ineligible to hold the office,
(a) if no candidate would be elected by acclamation as a result of the death or ineligibility,
(i) the election shall proceed as if the candidate had not been nominated, and
(ii) the clerk shall omit the candidate’s name from the ballots or, if they have already been printed, shall cause notice of the candidate’s death or ineligibility to be posted in every voting place;
(b) if another candidate would be elected by acclamation as a result of the death or ineligibility, the election is void and a by-election shall be held to fill the office. 2009, c. 33, Sched. 21, s. 8 (21).
Emergency
53.(1)The clerk may declare an emergency if he or she is of the opinion that circumstances have arisen that are likely to prevent the election being conducted in accordance with this Act. 1996, c. 32, Sched., s. 53 (1).
Arrangements
(2)On declaring an emergency, the clerk shall make such arrangements as he or she considers advisable for the conduct of the election. 1996, c. 32, Sched., s. 53 (2).
Conflict
(3)The arrangements made by the clerk, if they are consistent with the principles of this Act, prevail over anything in this Act and the regulations made under it. 1996, c. 32, Sched., s. 53 (3).
Time
(4)The emergency continues until the clerk declares that it has ended. 1996, c. 32, Sched., s. 53 (4).
No review or setting aside
(5)If made in good faith, the clerk’s declaration of emergency and arrangements shall not be reviewed or set aside on account of unreasonableness or supposed unreasonableness. 1996, c. 32, Sched., s. 53 (5).