bitcoin and Paypal are different and perform different functions,why bitcoin and Paypal fight?they can live together.

i think no

Like you
but I can tell a more understandable way, we can not compare Bitcoin vs paypal, because the nature of these two different types of money
Bitcoin is seen as a virtual currency of technology
And paypal is real money, it can determine the face value and gained worldwide recognition
And I think, we will jointly develop

I don't think that bitcoin will overcome paypal because, paypal is huge and bitcoin is pretty big but, not a lot of people besides people that use the internet a lot know about it a lot.

well they're increasing their fees for multiple options and even for currency conversion, adding 0.5% (e.g. 4.0% -> 4.5%), so bitcoin is only getting more attractive to sellers.

For now I think paypal still have the upper hand than bitcoins but still the latter were on state of development and progression so we can't say in the future what bitcoin might play in the world's economy. In this kind of advancement bitcoin does it can surpass paypal as to functionality and flexibility.

Bitcoin is reaching high even without much advertising. PayPal could have never reached such high if promoting the service is not perfect. Soon PayPal too might adopt the Blockchain technology at which the competence increases. So can't predict the future of bitcoin against PayPal currently.

For my opinion bitcoin can really overcome paypal since lot of users really like how bitcoin works,
Bitcoin doesn't have third party payment and everyone can use bitcoin and they don't have to give their real information so even the students can use it.

That is certainly true. While you can't reverse transactions with Bitcoin, you can help protect yourself from this by using escrow. In case you paid for a service or item that you did not receive, you can always submit a claim for the escrow to return your Bitcoin.

Still, if Bitcoin keeps making strides, then we can expect for PayPal to accept it sometime in the future, to make our life easier when buying things at ebay, which doesn't accept BTC for payments. This would probably happen once Bitcoin becomes scalable with the acceptance of SegWit and Lightning Network.

Nevertheless, I hope that cryptocurrencies like Bitcoin become scalable enough to handle more TPS, to become a better alternative towards using Visa or any other payment processor. It would be quite interesting to see, how this would be achieved, preserving decentralization at most. Just sharing my thoughts. 

Bitcoin will not overcome paypal because paypal really helped with those who wanted to purchase bitcoin, but you should be carefull in those who are dealing btc through paypal because some of them were scammers. Paypal has a specific use compared to bitcoin because the account is used to do payments using fiat money, and that options has nothing to do about digital currency.