How often do you want them to happen?
I don't know if it's been the same in NA but in EU whenever there's an effort to have semi regular cups they always end with having a lack of signups after the 4th or so(eg. essentials,esl). etf2l cups rarely have prem or even d1 teams participate, just a bunch of mid/high mixes playing vs each other in the "top" group (i don't think this was the case before 2016, i remember a less limited whitelist cup getting casted which at least had prem mixes play it).
I personally really enjoy cups i just don't see anything other than having one every once in a while working, big fan of playing matches back2back. (lockdown throwdown has been great so far, shame u cant watch the vods LOL :)))
[i wrote this before i read what doughy said me stupid :D ]