BIP-361 proposes migrating Bitcoin away from legacy cryptographic signatures to quantum-resistant alternatives through a phased deadline that could eventually make unmigrated coins permanently unspendable.
Signature aggregation could bring massive data-efficiency benefits to the network as well as open up more unique use cases, demonstrating bear market building.
By making traffic between network peers encrypted, Bitcoin Improvement Proposal 324 can improve privacy by hiding node locations and other private data.