That's what airbus expected when they developed the great white elephant. Turns out frequency works better, since pax prefer that to standing in line for an hour to board a cattle-car that's departing at an inconvenient time.

Also current widebodies are optimized for long-haul cruise so they are inefficient for shorter flights.

If traffic congestion got to the point where slot limits prevented more frequency the you might see widebody's optimized for short-haul.