As per my knowledge, there are no changes required for bitcoin as it is already proven itself in the market.
Change is the only constant thing in life. It's a principle that's cardinal to development. Whenever I hear people say Bitcoin should be left the way it is and that there isn't any problem with it, I am thrown off balance. What? With all these inconsistences of transactions and high fees and delays? Such frustrate the use of Bitcoin and that's got to change if we were to advance Bitcoin and get more people to use it.
We do really want some changes on bitcoin specially on scaling issue and to its fees but we do know it isnt possible to make such changes,if it does then Bitcoin would be the perfect coin among all who are in the market thats why some alts do patch up this kind of flaw from bitcoin and continue to progress since people do see it as an good option for them.