Of course, we all know that the answer to this will be a custodial wallet because many who are using exchanges see it as a threat to them because of the KYC challenges they may pass through when using it before making their transaction, furthermore, we should also remember that this is going to be a day-to-day digital currency we are going to be using to perform our transactions
Exchange will even become more inevitable than before and even if people could have left it because of the kyc but they wouldn't still have an option but to still come back and sort out the kyc so that the transactions will be very easy for them because in non custodian wallet I don't think you can be buying any coin of your choice so actually it will still take you back to an exchange for it and besides do you think if government should give the permission people will not trade again?, actually so long as there would be trading, custodian and non custodian wallet will be very useful and even if is not important for some persons in payment but for other purposes.