I personally think if they wanted to go the riddle route then they should have had them just replace the fists and not just double our number of buttons to manage them - especially given they said they were trimming down on ability bloat this expansion. This could have worked sort of how thunder and stones get upgraded to II / III / IV. Fists of Earth could have just evolved into Riddle of Earth at 64 (and a trait granted at that level for an additional 5% damage).

Tornado Kick could them consume all stacks and give a buff called Rolling Thunder which lasts thirty seconds.

We could have had another ability - Hurricane Kick - that consumes rolling thunder and 3 chakra to grant GL 3.

Boom.
Done.
Monk's get a far more reliable means to reacquire GL3. If GL3 is lost, we still use our GL dump for jumps. No more "shall I use Tornado Kick or roll the dice and pray I get hit under Riddle of Earth". No more upcoming Riddle of Wind which just adds needless steps to the process by having us... change stances (FoW) - tackle - tackle - change stances (FoF) - just to refresh stacks or get to GL2.

This Riddle of Wind change - for dungeons is great, probably. For raids - it's a muddy mess of a fix. For jump phases around 30 seconds long this will be our new Downtime Dance.

Change stances (FoW) - tackle - tackle - [BOSS JUMPS] Riddle of Earth (wait to get hit....) - change stances (FoF). All this while rebuilding Chakra and trying to maintain Coeurl Form.

My suggestion, which took all of a minute a week ago - gives us the same window for refreshing GL3 - grants us an actual new ability (we were the only job to not receive one this expansion - while classes like NIN got THREE!)