I think I personally seen lapels go from skinny to wide and ack about three times in my adult life, post Disco, late 90s Matrix and Mad Men. I think the "average lapel over the long haul has been about three and five eights with ties matching in width more or less. One VERY important detail not mentioned yet is the impact of high or low gorges on the overall look when combined with lapel width.
Wide lapels and a low gorge make you look like the suit is a holdover from the Miami Vice days and high gorges and skinny lapels kinda look dumb. Personally I try to stay around the average, slight preference for Gillian and high gorge.
Time to ditch the skinny lapel skinny suits, Moore's, Canada's answer to Men's Warehouse, is now pushing these suits. When a trend like that reaches a store likes Moore's, it is so over. Pretty soon every schlepp's grad and church suit will look like that. Mad Men finally arrives for the sartorially unwashed. Give it a couple of years and we'll see lapel so wide, they could fly to Hawaii again. I don't play this game any more.