Understandable. However, I feel that T-10 format could attract a bigger audience primarily due to the length of the games. Many people don't even have time to fully watch T-20 games from start to finish which is where the T-10 format comes into the picture.
It would definitely feel unfair at first, but I am confident that viewers would get used to it pretty quickly.
In the end, the viewers will get whatever they want. Even for the T10 format, the total duration (90-100 minutes) is slightly longer than a standard football match or a game of field hockey. In the future, T10 may become the preferred format and T20 may face the same fate as that of test cricket and ODI. Nowadays viewers want maximum action within a short duration, and T10 is very much suited for that purpose. And who knows? It may make cricket more popular in markets such as USA and Japan, where baseball is dominant.
I also agree that if they bring in another shorter format of cricket it will obviously be attracting more people to cricket.
Honestly, I think the popularity of cricket will surely increase if they do such a thing. But the problem is cricket will lose its basics. Everyone is going to come into the field and try to hit every ball out of the ground. And there will not be much skill required for that. And we all know that spin bowling is a part and parcel of cricket. And if t10 is introduced I think off-spin bowlers are not going to be needed at all. They will be out of the equation. All it is going to need is some really fast bowlers and some good leg-spin bowlers.