There is a lot of debate on this subject, and I’ve done a good deal of research on it but do not feel confident in my own understanding yet to deliver much in the way of explanation.  Therefore, I am posting the following resources for your own due diligence regarding Bitcoin’s scaling debate.  Additional sources will be added as I run across reliable information.
Coindesk.com : http://www.coindesk.com/2016-bitcoin-protocol-block-size-debate/
BTCManager.com : https://btcmanager.com/three-hurdles-bitcoin-must-overcome-in-2017/
BitcoinMagazine.com : https://bitcoinmagazine.com/articles/what-experts-are-predicting-for-in-bitcoin-and-blockchain-tech-1483481777/
Nasdaq.com : http://www.nasdaq.com/article/what-experts-are-predicting-for-2017-in-bitcoin-and-blockchain-tech-cm728966