It seems that every parameter of the chain can be modified based on a proposal.
Number of delegates (committee), number of witnesses, pay rate, etc.
There is an operation
struct global_parameters_update_operation
{
asset fee;
chain_parameters new_parameters;
That is included into a proposal (proposed_ops)
struct proposal_create_operation
{
account_id_type fee_paying_account;
asset fee;
vector<op_wrapper> proposed_ops;
time_point_sec expiration_time;
optional<uint32_t> review_period_seconds;
That can modify every aspect of the chain if accepted.
struct chain_parameters
{
fee_schedule_type current_fees; ///< current schedule of fees, indexed by @ref fee_type
uint32_t witness_pay_percent_of_accumulated = GRAPHENE_DEFAULT_WITNESS_PAY_PERCENT_OF_ACCUMULATED; ///< percentage of accumulated fees in core asset to pay to witnesses for block production
uint8_t block_interval = GRAPHENE_DEFAULT_BLOCK_INTERVAL; ///< interval in seconds between blocks
uint32_t maintenance_interval = GRAPHENE_DEFAULT_MAINTENANCE_INTERVAL; ///< interval in sections between blockchain maintenance events
uint32_t maximum_transaction_size = GRAPHENE_DEFAULT_MAX_TRANSACTION_SIZE; ///< maximum allowable size in bytes for a transaction
uint32_t maximum_block_size = GRAPHENE_DEFAULT_MAX_BLOCK_SIZE; ///< maximum allowable size in bytes for a block
uint32_t maximum_undo_history = GRAPHENE_DEFAULT_MAX_UNDO_HISTORY; ///< maximum number of undo states to keep in RAM
uint32_t maximum_time_until_expiration = GRAPHENE_DEFAULT_MAX_TIME_UNTIL_EXPIRATION; ///< maximum lifetime in seconds for transactions to be valid, before expiring
uint32_t maximum_proposal_lifetime = GRAPHENE_DEFAULT_MAX_PROPOSAL_LIFETIME_SEC; ///< maximum lifetime in seconds for proposed transactions to be kept, before expiring
uint32_t genesis_proposal_review_period = GRAPHENE_DEFAULT_GENESIS_PROPOSAL_REVIEW_PERIOD_SEC; ///< minimum time in seconds that a proposed transaction requiring genesis authority may not be signed, prior to expiration
uint8_t maximum_asset_whitelist_authorities = GRAPHENE_DEFAULT_MAX_ASSET_WHITELIST_AUTHORITIES; ///< maximum number of accounts which an asset may list as authorities for its whitelist OR blacklist
uint8_t maximum_asset_feed_publishers = GRAPHENE_DEFAULT_MAX_ASSET_FEED_PUBLISHERS; ///< the maximum number of feed publishers for a given asset
uint16_t maximum_witness_count = GRAPHENE_DEFAULT_MAX_WITNESSES; ///< maximum number of active witnesses
uint16_t maximum_committee_count = GRAPHENE_DEFAULT_MAX_COMMITTEE; ///< maximum number of active delegates
uint16_t maximum_authority_membership = GRAPHENE_DEFAULT_MAX_AUTHORITY_MEMBERSHIP; ///< largest number of keys/accounts an authority can have
uint16_t burn_percent_of_fee = GRAPHENE_DEFAULT_BURN_PERCENT_OF_FEE; ///< the percentage of every fee that is taken out of circulation
uint16_t witness_percent_of_fee = GRAPHENE_DEFAULT_WITNESS_PERCENT; ///< percent of revenue paid to witnesses
uint32_t cashback_vesting_period_seconds = GRAPHENE_DEFAULT_CASHBACK_VESTING_PERIOD_SEC; ///< time after cashback rewards are accrued before they become liquid
uint16_t max_bulk_discount_percent_of_fee = GRAPHENE_DEFAULT_MAX_BULK_DISCOUNT_PERCENT; ///< the maximum percentage discount for bulk discounts
share_type bulk_discount_threshold_min = GRAPHENE_DEFAULT_BULK_DISCOUNT_THRESHOLD_MIN; ///< the minimum amount of fees paid to qualify for bulk discounts
share_type bulk_discount_threshold_max = GRAPHENE_DEFAULT_BULK_DISCOUNT_THRESHOLD_MAX; ///< the amount of fees paid to qualify for the max bulk discount percent
bool count_non_prime_votes = true; ///< set to false to restrict voting privlegages to prime accounts
bool allow_non_prime_whitelists = false; ///< true if non-prime accounts may set whitelists and blacklists; false otherwise
share_type witness_pay_per_block = GRAPHENE_DEFAULT_WITNESS_PAY_PER_BLOCK; ///< CORE to be allocated to witnesses (per block)
share_type worker_budget_per_day = GRAPHENE_DEFAULT_WORKER_BUDGET_PER_DAY; ///< CORE to be allocated to workers (per day)
Power to the shareholder!
Thinking out loud.
If the community (shareholders) thinks that is better to lower/raise some fee, or to have more witnesses or whatever, they will vote a delegate (or convince any active delegate) to propose that change for later approval.
This is huge^3.