Coming back to @vishnu statement, his position on audience's fatigue or overdose of IPL is true and might backfire on BCCI but we shouldn't forget that after 3-4 months halt due to pandemic audience are hungry for some sort of entertainment in the cricket and then we have revenue angle too.
Why is there a talk about audience fatigue when there is no possibility that the ICC will allow the BCCI to conduct their tournament consecutively when the international schedule is halted in the name of pandemic and it will not help anyone as other cricket boards will come up with their franchise cricket and ICC will be forced to take a neutral stand.
Because once ICC officially announce the complete cancellation of T-20 WC, then no one could stop BCCI (except covid-19) as slots are technically free to use for anyone and BCCI just got lucky. One could argue what about FTP (Bilateral series)? but BCCI is already covered as there was no bilateral commitment during that period except World Cup and Australia's tour (Schedule in Nov-Dec-Jan). There is one more factor "Asia Cup" but schedule is not fixed yet and decision is pending for quite some time, let's see what happens.
About other boards.
PSL - Already finished (3 games left only)
BBL - They might go with the league as India already touring Australia at the same time, it happens every year. (Dec-Nov-Feb)
After all this comes fatigue argument...
@Vishnu.Reang May be.. As of now everything is speculation so let's see. Having said that BCCI really want to organize IPL due to revenue, which is very understandable argument, nothing wrong with that and no one should really blame them for it, money is important too IMO. Players can't sit out whole year without playing any cricket.