Arguments like this, in the abstract, are useless. Its just going to shit up the thread.
One has to consider real world uptime when comparing proc vs on-use trinkets too. The raw DPS figures assume a fight where you have complete uptime on your target for the entire proc, but in actual raiding scenarios this is not likely in current content. Proc trinkets are near-useless if they happen to proc just as say Atramedes flies up in the air or you're forced to move out of the group with the frost debuff on Maloriak, etc. Wrath had a lot of fights with 100% uptimes on bosses but right now in current content there's a lot of fights where we have to target switch, run out, run away, etc.
This causes the real world value of on-use trinkets to rise and proc trinkets to fall quite significantly on many fights, and it's thus going to end up being in people's interest to have a variety of trinkets in their arsenal to switch around from fight to fight.
(And of course we have our heroic fights where our job as frost is to do absolutely nothing but kite adds around for 8 minutes.)