Does il y a toutes les chances require the subjunctive?
No, il y a toutes les chances does not take the subjunctive:
Il y a toutes les chances que mon frère a tout gâché.
There is every chance that my brother has made a mess of things.
À noter : There’s some disagreement about these types of expressions, but it comes down to possibility vs probability: the former requires the subjunctive, the latter the indicative. In my (and many others’) view, toutes les chances is on the probability side of the scale, which calls for the indicative.