Well I for one am happy Corey is doing the VO. As for concerns over the quality of VO, I believe any concerns over the performance in Shenmue I & 2 were due to voice direction.. probably. From what I've heard/read of voice direction of Japanese made games of the era the directors didn't really know what they were doing to make the line reading sound organic for the English speaking audience.
With all that being said, Shenmue III could be made with Dreamcast era graphics and Tom level of VO and I would still be all for it lol.