Yeah, the era might get better over a larger sample. I'm willing to bet the K's won't improve much without heavy editing though. Low strikeouts have been an issue in the stats for awhile now. In fact, pitcher stats in general have been too random. Not saying this is definitely an indication of that...just that the small sample of numbers unfortunately trend towards history.
The bright side is that last year, you could get some solid sim stats with editing. So, in theory, any issues should at least be mostly fixable (assuming, of course, that there is no cap in 2K10).