If an airline needs to increase transactions fees for transferring airline miles or add a KYC / AML identity program, it would need every node and miner on the network to approve the change by updating their software. (links2exchange.net)
The one - megabyte limit has created problems for Bitcoin transaction processing, such as increasing transaction fees and delayed the processing of transactions that can not be fit into a block. (bit-media.org)
Volatility in the Bitcoin market also bumps up the number of transactions, which — given the Bitcoin network's congested nature — increases transaction fees in unpredictable ways. (fortune.com)