The best replacement for protobuf is json.

The best alternatives to protobuf are rated as following:
★★★★★  json
★★★★  thrift
★★★★  avro
★★★  java serialization
★★★  msgpack
★★★  protostuff
★★  bson
★★  kryo
★★  binaryformatter
★  json.net
★  asn.1
★  yaml

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No companions for protobuf have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of protobuf in all years. Click on graph for more.
protobuf
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