Your math is off on that one. If you want to count hours, we can do that. In the old Dynamis, a city run can be done for 3 and a half hours or 210 minutes. Old dynamis run can be done twice a week. So, 210 x 2 = 420 minutes.
New Dynamis is done for 2 hours maximum, or 120 minutes. But, it can be done everyday of the week, so 120 x 7 = 840 minutes. Or, in other words, I can spend twice the amount of time in New Dynamis than in the old Dynamis.
A bit of market speculation there, eh? If Dynamis currency is more easily attainable, I can see people telling the bazaars in Rolanmart to take a jump off of the bridge. Supply will go way up as more currency is available with this update.
Well, the devs did mention changing the requirements for mythic and relic to be on par with the empyrian weapons. We'll have to see what they do before we go "They changed it now it sucks!".
Again, your math is wrong on that.