Quote from: wilwxk on March 18, 2018, 06:00:11 PM

But the current size of blockchain is a problem if continue growing like now, there will no reason to store 200 gb of blockchain while you can only use a wallet which connects to other nodes, and this will be problematic for the decentralization

The answer to your 'problem' has been posted 38 minutes before you have decided to post:

Quote from: DannyHamilton on March 18, 2018, 05:12:24 PM

Additionally, if you don't want to store (and copy when you upgrade your system) the entire blockchain, you can turn on pruning mode. That will purge old blocks that have already been processed, and drastically reduce the amount of storage space you'll need.

Quote from: wilwxk on March 18, 2018, 06:00:11 PM

with the solutions like segwot and lighting network, maybe this problem can be solved

Neither segwit nor the lightning network result in a smaller blockchain to store.
You can read more about segwit here: https://cointelegraph.com/explained/segwit-explained and more about the LN here: https://en.bitcoin.it/wiki/Lightning_Network