I agree with the above posts about the pros and cons, with academic pursuits obviously being easier to pursue with the extra year.
I believe that more and more programs will be forced to convert to six years. The reason for this is the 80 hour work week requirement. Most programs simply cannot comply with this requirement unless one of two things happen:
1. attendings directly back up juniors so more senior residents have fewer nights on call (i.e. get tossed into the mix for in house call, putting more residents into the available pool for first call). I don't think many attendings would be willing to do this and take the lower salaries associated with academic practice. Plus, when would they have time to actually do their research?
2. They have more residents to spread the call and workload. The ACGME does not appear to be willing to expand all residencies' accredited clinical programs, so to get around this programs will add a "research year" that is not officially counted against programs clinical resident numbers. This way they can plug the "research" guys into call schedules to keep them clinically sharp while they are in the lab (or on the golf course as the case may be). This is an easy way to get more night time manpower so your clinical residents have fewer hours logged. This will open up more spots for hopeful orthopods in the making, but at some point if all residencies are doing this it will dilute the incredible talent pool from which ortho has always been able to draw. This is just my take, but I've already seen it start to happen. I really don't see any other way for programs to comply with the new requirements because there is X amount of work and only Y number of residents to do it. The amount of work is only going to go up, so something has to give here. Personally I don't like the 80 hour work week, I think it detracts from our experience. There are obviously valid arguments for it in certain cases of people being too tired to perform, but I don't think a cap on hours is the right way to ensure patient safety.
I would love to hear other comments, particularly from attendings.