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I doubt that your argument is correct, because the apostles and Christ Himself got baptized, proving that baptism is at the very least necessary for those willing and able. But, let's accept your point and pretend it were correct, and look at the logical consequences. The Old thief died under the Old Law, but once Jesus Christ died and resurrected from the dead, the New Law was enacted.

I do not think your reasoning makes sense. According to you, exactly at the moment of Christ's death, millions of people (whom under the Old Law could get to heaven through a process similar to BOD/BOB) suddenly cannot. Considering that the Gospels took centuries -if not millenia- to be spread to all corners of the world, that means millions whom, under the Old Law had a chance at salvation, suddenly having no chance at salvation at all and being sent to hell, without any changes in their actions compared to their predecessors.

I do not think it would be logically consistent to do such a thing. Why would God do so?

The council of Trent and Pope Benedict 12 said that baptism is required under the new law which started with the promulgation of the gospel (when Christ told his disciples to teach and baptise the nations).

Your second paragraph is emotional cope. Most people are not saved. The elect are always saved. There is no reason to Doubt that God cannot bring baptism to HIS ELECT. St Augustine said Sacrament of the Mediator, this is water baptism as baptism of desire is not a sacrament as defined by the Church.