Maybe 
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No of course not. I just did the maths for myself and thought it would be a good idea to share with the community.
You forget the gem keys in your comparison. So glory+gem = event, maybe.
Difficult to compare gems and diamonds when diamonds give you a 100% chance for a Mythic. What do you prefer 4500 gems or 4000 diamonds? Because even with 4500 gems you are not sure of a 100% drop rate. I know that too much well as I spent 6k gems last mythic…
As I said, if not it’s an issue: the deviation seems to me too big. Some players get a Mythic in 50 glory keys and others don’t with 4k gem keys… And that’s why I think we should have a pity timer (even if I really doubt about that)…
For one month. It’s not that hardcore.
Not so much solution for that. Aside if you focus on diamonds, you can have 4000 of them in 6.7 weeks. So every year a free Mythic, yeah… Else you have to give them some dollars to go faster.
And that also means only 360 gems for the Mythic so it will be more difficult to obtain the gambled Mythic…