Ha! 6 teams, well let's see. 
Just defeats the whole purpose. What is the point in having a six-team competition? I don't think that the International Olympic Committee (IOC) will even approve this stupid plan. All of the Olympic sports have a well-defined qualification criteria, and they have geographic representation from all the continents. ICC's idea will be rejected outright (perhaps they want this, since they can use as an excuse).
Let's compare some of the sports in 2020 Tokyo Olympics:
~edited out~
As you can see, only baseball and softball are the items with less than 12 participants. And in any case, all the participants need to take part in the qualifying tournament. The idea of a qualifying tournament will be unpalatable for the ICC.
I checked the ICC proposal:
https://www.timesnownews.com/sports/cricket/cricket-set-for-olympic-return-icc-propose-6-team-men-and-women-tournament-for-la-2028-reports-article-95624067
They don't want qualifying tournament, and want teams to qualify based on their own ranking. This proposal will be rejected outright by the IOC.
I actually hate ICC's behavior on the qualification process, it's just flowed idea that they keep doing this on a rank basis and seriously I don't have any expectations from them as far as ICC tournaments are concern but IOC has power so there is some hope for Olymic qualification.