Can what Leonidas, an Ordinal's developer said if bitcoin developers reverse their decision and want to censor Ordinals transactions
Source to their statement would be great, since censorship could mean many things.
I think Ordinals and BRC20 may stay.
They will stay. Until this day, AFAIK many developer don't even agree to make
OP_FALSE OP_IF ... OP_ENDIF as non-standard script, when the script would never executed. In addition, no monetary/financial transaction would ever need to use such script.
They argued that they generated money for bitcoin miners which are maintaining the security of bitcoin network.
Of course. And they also started bloating the UTXO set, which means, that there is more and more disk space needed, to run a pruned node. In the extreme case, the size of the chain can be comparable to the size of the UTXO set. Fortunately, we are far from that, but now, everyone can see, how to spam the chain. So, that kind of things can be done: blocks can be filled with a lot of outputs, sending zero satoshis to the UTXO set, or a lot of non-consensus data in the witness space, behind OP_RETURN, or anywhere else.
It's also to worth that the UTXO growth force you to use bigger RAM capacity or use fast SSD (to read/write UTXO change quickly).