Read through it again to change two typo errors, it is proof of stake.
Since I'm writing the post using my phone, the auto correction sometimes goes wrong. However, fixed now. Thanks.
I do not believe this, people only making use of bitcoin to make conclusion, do you think if bitcoin community agree to make bitcoin more scalable with PoW not changed, do you think it is not possible? It is possible.
Litecoin is using POW, transaction is 3 minutes to complete.
Dash is using POW, transaction is completed almost instantly.
Digibyte is using POW, transaction is completed almost instantly.
Comparing to the other pow coins, these transactions can be done faster, yes. But if compare the average speed of PoW transactions to PoS, you will see the difference. For example, If the number of transactions increase hugely on LTC, you won't have your transaction done in ~3 minutes.
Take a look at this graph and you will understand, yes, the transaction time is mostly stable at ~3min. But, we had is sometimes at 4,5 or six minutes.
However, repeat once again. You will to consider the average transaction times of all pow coins for comparing to pos coins not just a few coins.