The blockchain is seen as the main technological innovation of Bitcoin, since it stands as proof of all the transactions on the network. A block is the current part of a blockchain which records some or all of the recent transactions, and once completed goes into the blockchain as permanent database. Each time a block gets completed, a new block is generated. There is a countless number of such blocks in the blockchain. So are the blocks randomly placed in a blockchain? No, they are linked to each other (like a chain) in proper linear, chronological order with every block containing a hash of the previous block.
The ever-growing size of the blockchain is considered by some to be a problem due to issues like storage and synchronization. On an average, every 10 minutes, a new block is appended to the block chain through mining.
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On the other hand, the second vision of a long term saving medium and international payment network is more inline with the unique strength of bitcoin: Limited supply, censorship resistance and trustless transaction. No existing financial solutions can compete with bitcoin in these area, so it will quickly occupy the market where these properties are desired and become the leader