First of all, I don't see Paul declaring himself as the last apostle in 1 Corinthians 15:8. He does say that he is the last in his list of those who saw the post resurrected Jesus. He then follows by stating in verse 9 that, in his opinion, he is the least of the apostles. But I think its a stretch to connect the two as him saying he is the least and the last.Second, if we presume to determine that the role of the Apostle is no longer needed/important, we bring into question Ephesians 4:11. To eliminate one office would then open the door to question the ongoing need of any or all. It also positions us in the same place as those who claim that tongues have ceased with the written word, and are therefore not for today. I get that we have backed away from some titles because of the misuse and abuse that is prevalent. I think we would be better served to study such things out and have a clear biblical understanding. That would protect the church from the title chasers who seek to misuse scripture to define their desire for recognition. It would also make room in the church for all that God has set in place for the church.