Btw I don't like the system. Some of the "slower" pipsqueaks full with enthusiasm will probably fall (Krys, AbuRaf) - competition won't be the same without them.
That's why I liked IMSA Cup: your qualification result decided only the "pot" for the group stage. Hmmm... maybe the next special Unskilled event will be like that (instead of USL). 
I respect your thought and your individualities. But it should be kept on mind the root and the target of ISM.
Since its creation ISM has a declared main goal, well described (not by myself) in the Wiki: "conceived as a sort of "World Cup" for Stunts, it pitches selected top r""acers in a variety of tracks and cars on a short contest".
ISM wants to host races with a high concentration of quality, as we can find in the Tennis Master, creating a context and an atmosphere suitable to arouse sane challenge and top results, that mean great show and important sap for our world.
And this is what happened in the past editions. Selection has been in the past through Stunts World Ranking, and this year by a Qualify session. So drivers who wants to take part in ISM are usually drivers strong and motivated, and the process of selection can only contribute to increase this features.
SDR has always offered in the past events open to all drivers (early RH and NORH contests and Stunts Olympic Games) and so it will continue in the future with new kind of events. But ISM is, and will be, a contest conceived and reserved to the strong and motivated Stunts drivers. This means that always there will be a selection process that, unavoidably, implicates some exclusions, as it happens in almost all real sport events.