Yes, you have two options here.
First, if you're really certain, the administrator can remove their own administrator permissions, and then the chain will have no administrator. But this is quite a final one-way street, so I'm not sure it's the best choice.
Second, you can set up the chain to have multiple administrators, with all important changes in the chain agreed subject to consensus between those administrators. See the admin-consensus-* blockchain parameters here:
https://www.multichain.com/developers/blockchain-parameters/
In any event we have certainly designed MultiChain to function well without a single central admin.