WI Irish Slaves?

[NapoleonXIV]

WI the Irish war under Cromwell goes much worse for the Irish? It drags on until the end of the Protectorate in 1658. Under it, the English policy is to treat all Irish as slaves and send them to not only Jamaica and Barbados but to the new American colonies as well.

The law turning the Irish into slaves is, for one reason or another, not rescinded with Cromwell's fall. The English continue the policy, which treats Irish as if they were Africans, with their children slaves as well. Over the next few decades, Ireland is virtually depopulated and replaced with English settlers, while practically all the Irish are now slaves in the New World.

Assuming this could happen, what would be its subsequent effects on the Old and New Worlds.