The only problem with this is that the size of the blockchain would become much bigger.
This ^^^ is why you always need devs around... I know the eXo client has a built-in Block Explorer but I had no idea that there are such trade-offs... if there are plans to trim the Qora blockchain in the future anyway (are there?)... why not?

I can't say exactly how much bigger it would be.
It is something that will need to be calculated to see if it is possible.