I choose such assumption based on the past experiences.All the assumption are based on my own and others experience and through my observations. No doubt cricket entertains millions of people around the globe. Assumptions are made on basis of collection of information and data from different primary and secondary sources.
If the sports concept doesn't  exists then talents of the people who made great achievement in the field of cricket would be a waste.people would not known great legends like sachin tendulkar, Rahul Dravid etc.
All the information are available on internet and other primary and secondary data base or sources. We can verify and even disapprove such assumption  by comparing our assumption  and factual information.
Instead of assuming the cricket system in the present in the presence trend, we can also make improved assumptions like big stadium with expert coach and people can have better facilities and new trends.