If we believe the Hily Spirit protects the infallible pope, we can be assured that whatever comes down is the Holy Spirits will and completely orthodox. Even if it is contrary to our fallible opinions.
We need to remember that sometimes, what we see as (at least tantamount to) dogma really is interpretation of (or deduced from) dogma. While these deductions may seem logically watertight, I sometimes get a feeling they may not be.
Now to be clear, I don’t see how the Synod could make any big changes, as I don’t see how we could conclude differently from dogma to practice. However, if we interviewed someone who lived in the 19th (or earlier) century, pre- modern psychotherapy, I would not be surprised if they described the notion of giving a suicide a Catholic burial as heterodox and something that would “never happen”. Yet here we are, burying those who commit suicide without even giving it a second thought theologically.
If anything, I think we ought to be humble regarding our understanding of dogma, and avoid smug assertions that “nothing will change”. It is true that it probably won’t. However, I’m also getting a sense that it may. So personally, I avoid strong assertions.
The only thing I know, is that the Holy Father and the bishops
will be guided by the Holy Spirit during this Synod. Our duty is to pray for them, and faithfully listen to their conclusions. Other than that, speculation may be interesting, but it is not really fruitful. Neither is worrying that the sky will fall. Nor is hoping that dogma will change, because it won’t. Everything else, however, I would be careful of asserting either way.