Exactly. Some do like and some don't. Its just that in India we don't find many liking this format (length being the issue like you said). Sometimes opponents also matters (IMO).
Regarding changing format, the problem in Test no getting attention I can guess we can change that first need to determine the cause properly for the decline in crowd attendance.
Outside South Asia, it looks like ODI cricket is losing popularity. Almost all the test playing nations and many of the associate nations have now started high voltage T20 franchise tournaments and nowadays a lot of the fans prefer these leagues when compared to international cricket (especially ODI and test). My suggestion is that cricket needs to change with time and the ICC needs to stop giving unfair advantage to the formats which have waning popularity among the fans.
Well cricket fans have different kind of mindset and preference around the globe. In India we have Test not being popular while in England they find test entertaining to watch. Its same with other format as well. Its not kinda goes all hand-in-hand with every area and nor will come close in future I guess.
I though think you have something in your point with increase/decrease in no. of games in format instead of changing the format.