Guild Wars 2

elemental attunement -> master
renewing stamina -> master
cleansing wave -> master
aquamancer’s alacrity -> master

how is this supposed to help build diversity?

here are (imo) the two biggest things that limit build diversity:

15 in water for heal on attunement. Without cleansing wave or aquamancer in adept all the adept traits are useless, meaning i will now have to invest 20 to 30 points in water to make this traitline useful.
10 in arcana for elemental attunement. 30 in arcana for evasive arcana (NOT for the attunement cooldown) is so strong regardless of the build you are running I doubt many eles run without. I have made many a build with only 10 in arcana for elemental attunement for the synergy with 30 in water and the boons and I never ever noticed that my attunement cooldowns were a couple seconds longer, only the lack of evasive. Moving elemental attunement to master tier is only going to further reduce build diversity.

Conclusions:
The projected patch notes are only going to further limit build diversity for eles and do nothing to improve their viability and will in fact have the opposite effect. Unless diamond skin goes in as projected, which I seriously doubt it will because it would be too completely broken OP.