Could prepared Manila Bay defences have prolonged resistance?

Would a prepared defence of Manila Bay have allowed US forces to hold out longer in the Philippines?

Potentially; prepared defensive positions might have improved resistance, without necessarily saving the campaign.

An earlier plan centred on defending the Manila Bay area might have prolonged the US Army's resistance in the Philippines. Prepared defensive positions would at least have given the defenders a stronger chance. This remains a limited operational counterfactual, with no claim that the islands could have been held indefinitely.