Well, the Quartus 13.0sp1 (supports CycloneII device family) has a number of smaller/larger cell count devices that are footprint compatible.
Depends on if you want to stay in the same (now EOL/obsolete) device family.
I doubt you will find any newer devices CycloneIV/V/10 or MAX5/10 that are drop-in footprint compatible.
That will take a bunch of work on your part reading data sheets and comparing device pinouts.
Unfortunately the Quartus migration tool does not help very much when going between device families.
You may want to refer to this link : https://cdrdv2.intel.com/v1/dl/getContent/654376?explicitVersion=true
Check Table 1-3.
You can check with distributors if the replacement part number is available.
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