India, who hold the hosting rights for the next Champions Trophy in 2021, lost the title to Pakistan by 180 runs in the finals at The Oval on Sunday.
Despite the question-marks over its relevance, the event received huge response from global audience as millions tuned in to catch the action on television.
However, Richardson said there is no guarantee that there will be another Champions Trophy after 2021 and the issue will be discussed during the ongoing ICC annual conference at The Oval.
"At this stage, the next Champions Trophy is still scheduled for India in 2021. Whether that gets changed, the consideration has been given to changing to two T20s in a four-year cycle which would mean swapping the Champions Trophy for a World T20."
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The ICC CEO said World T20s could involve upto 20 teams in future.
"The fact is that World T20s do attract a lot of interest, they generate significant revenue for television companies, but most importantly from our point of view they provide us with an opportunity to give opportunities to more teams.
"It might not be necessary to continue with two 50-over tournaments going forward," he added.
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