I definitely don't think they should go back to playing the crappy boring stuff they did on Subterranean/Jester race. I mean, Come Clarity was probably the best metal album ever written, pure genius. Besides, there aren't enough bands today playing the Come Clarity style (Soilwork doesn't count because I said so).
Come Clarity was good just not great like their earlier albums, In Flames is still my band because I can put on any of their albums and still be pumped. Although Jester Race still gets about 90% of the playtime.