Yes, we could. If the Democrat advantage in VBM+IPEV in critical states like NC and FL is reduced to 0 or less by Tuesday, then it's hopefully not a problem. But even then we still don't know who those voters picked; we only know their party registration and in many places (MI, WI, TX, GA...) we don't even know that.
Hanging our hats on the assumption that we're going to slaughter the Democrats (figuratively, of course) on election day because that's what happened at some point in the past is directly at odds with the unusually high number of Republicans voting prior to E-day. "Cannibalizing" isn't just for Democrats anymore. In many places there will probably be more R than D left to vote on 11/3, but our side still has to actually show up because we're relying on a major advantage on that one day. After 11/3 we'll see big gains for the other team.
Who is relying on a major advantage? You seem to be. The GOP historically wins on ED. The GOP is in a stronger position in NC relative to 2016 in EV Dem advantage (9K lower as of this morning) and banking a net of a quarter million more GOP registered voters since Trump last won. That is a strong position to be in, but it does not guarantee a Trump victory.