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You are right there was decline in Kenyan cricket since 2003 World Cup major high point for them. It is clear that countries like Uganda are improving Kenya is falling behind and could soon be overtaken by other regional teams like Tanzania and Rwanda and Malawi. You are also right to criticize ICC for its role in this as they havr seemingly supported countries like Zimbabwe while neglecting to give enough money to promising nations like Kenya. This lack of funding from global governing body is big reason cricket has struggled to grow in smaller countries.
If you look at it, Kenya has kind of disappeared from cricket, but Kenya once had a good chance of doing well in cricket. You have raised an important point here that most teams disappear from cricket due to financial problems. However, if the government of a country wants to take cricket forward, I think it will not be a big financial problem. Through sports, we have learned about many countries, learned about the culture of many countries and learned about the cricketers of many countries. If we see more new teams joining cricket in the future, then we will have a better idea about all those teams. I think that even after thinking about these issues, these countries should invest money behind cricket and make their countries known to the world. I really like that thing when every country participating in the World Cup is introduced internationally on the stage of the World Cup.