If they keep the Monarch Crab, and say for example make it 2 sockets, and a base stat along with stam it'l still be one of the best trinkets in the game, why, flexibility that goes beyond what a normal trinket can do.
The sockets on those trinkets are the key to an incredible piece, not the actual trinket itself. Although 1 min CD on 300 dodge is so sexy its hard to not call it lengths ahead of most other trinkets in the game based on that anyway, but you have a trinket with stam, and with the potential to have more stam, or defense, or dodge, or parry, or put 2 x 27 strength in there and make it a threat/avoidance and partially stam friendly trinket. So many options.
You can tailor make a trinket that changes with you as content changes with you. Every other trinket besides the JC ones are static in nature, with no hopes of being modified, customized and allowed to grow as content changes prevail and gear swaps because potentially "gearset breaking"
Will the BoP gems lose their benefit when the epics come out, to some extent yes, but in others no. Prismatics allow you to forgo picking up a stat you don't want for meta requirements, or having to nerf one stat to satisfy that requirement also.
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