lboiv, welcome to the forum. Hobie has made well over 100,000 kayaks so far and has a pretty enthusiastic following, so you can see that cracks aren't much of a problem for most users. From what I understand, less than 1% of the boats develop cracks, so the odds are excellent, that you will never experience any problem. The majority of drivewell cracks appear to be with the '06 and older Mirage Drive boats in conjunction with Turbofins (which were newly introduced in '06).
Regardless of the odds or manufacturer, there is always a possibility you could be
the one whose boat develops a crack. So the more important question might be what happens then. If you look through the forum, you will find some of the most avid Hobie fans are those who have actually had a problem and experienced Hobie's outstanding warranty service.
We also have a Sport -- great little boat (and problem free)! As sunjammers indicates, it should give you many years of great fun and outstanding service!