Bill Combs blogged that churches should abandon the KJB (http://dbts.edu/blog/should-churches-abandon-the-king-james-version/) and that churches should use modern versions (http://dbts.edu/blog/churches-should-adopt-a-modern-version-of-the-bible/).
His reason for abandoning the KJB is simple: the KJB was made a long time ago, and more information has been discovered since that time.
This is potentially a fallacy because more information does not necessarily mean that what was done must now be abandoned.
But looking from a Biblical and a divine aspect, when it can be shown that the sufficient amount of data was available for the KJB men, then all newer discoveries are not in any way counteracting what was done, because to do so would be to say that:
1. Christians did not have the Word of God while all the discoveries of new manuscripts had not occurred, and
2. Christians do not have the Word of God because all discoveries have not taken place, or that human knowledge is yet limited.
2 Cor. 3:5 Not that we are sufficient of ourselves to think any thing as of ourselves; but our sufficiency is of God;
2 Cor. 9:8 And God is able to make all grace abound toward you; that ye, always having all sufficiency in all things, may abound to every good work:
These two verses show that God’s supply of sufficiency (the KJB) is enough. Thus, with all the new information, the KJB is still right. No need to change it.
The other reasons why Bill Combs promotes modern versions are because he thinks the KJB is hard to understand and because he does not agree with the translation.
On understanding, the issue is actually the Scripture, not the KJB. And understanding is given by the Holy Ghost, so pretending to communicate better is no solution. Dumbing down the Word of God is never a good solution.
As for the translation issues, these are entirely subjective points, made by people who appeal to no final authority, but what would suit their own opinion at every place, which really means that they don’t want the Bible to tell them what to do, they want to tell God what they want to do.