There's been some talk recently about how a 6-man rotation would help reduce stress on pitchers' arms in the long run especially in light of all the Tommy John surgeries this year. Bobby Valentine pretty much said that 'one starter may pitch less games in one season, but he may pitch many more games in his career' in a 6-man rotation. Yu Darvish recently pushed for a 6-man rotation along with Colby Lewis who both liked the system in Japan.
With guys like Harvey, Wheeler, Niese, Gee, deGrom, Colon, Montero, Syndergaard, Hefner, Matz etc in the system, maybe the Mets should play to their advantage and push some boundaries many teams aren't willing to do. If there's a team that can roll out an effective 6-man rotation, it's the Mets. This front office is so statistically driven that I'd love to see them be the pioneers of something new in this era of MLB. Each starter would get an extra day of rest, would around pitch 27 games instead of 32 games a year, and pitch about 25-35 less IP per year because of it.
Yes, the team also needs to fill holes at LF and SS, and trading pitching might be the best way to do that, but say the Mets only deal one of these starters in the off-season, shouldn't the Mets at least consider the idea of a 6-man rotation?