There is more scriptural “evidence” to argue for a Trinity then there is for the Overlapping Generation.
The key thing to understand is different Bible writers had different ideas of who Jesus was. The writer of Mark had believed a very human messiah adopted as God’s son, whereas the writer of John clearly believed that Jesus was fully divine, while a distinct person from the Father and the Holy Spirit.
To 'disprove' the Trinity, or to 'prove' it, one must span different Bible books written by different writers.
To discount the Overlapping Generation of Matthew 24:34, one simply goes to Matthew 1, within the same book of the Bible, by the same writer.