Afraid in invest on bitcoin what reason they are afraid? Do you have any idea??

Yes ! These are some of the reasons why some are afraid to invest in bitcoin.
1.Hacking risk. On December 19, 2017, a South Korean cryptocurrency exchange said it would file for bankruptcy after it was hacked for the second time that year. Over $70m worth of bitcoins has reportedly been lost by several cryptocurrency exchanges and miners, highlighting concerns about the security of such currencies.

2.Hard fork" splits. Since the value of and support for the currency depend entirely on the community using it, disagreement between the stakeholders may result in the splitting of the network to support new competing cryptocurrencies, this is known as a "hard fork".
For example, Bitcoin Cash (BCH) is a hard fork from the original Bitcoin. Effectively, BCH is now a different cryptocurrency from the original bitcoin, inviting stakeholders to sell their "old" bitcoins and invest in this new one.

Since there is a lot of hyped on tron i believe this could lead to "panic buying" and i think we should be mindful  of sudden drop again on tron.

I think generally that business is a pool of risk and if you put all these factors into consideration ,you may end up no investing at all. Despite,thorough research you can not totally conclude that you have invested on a pump and dump project. You can take the risk and invest in a project you have searched and it may turned  out be a successful project. I have the feeling that investment is sometimes a 50/50 chances of getting a good project.

People have been hearing Dash but doesn't know what it is. Please what do you about DASH.

In summary, Dash is unlike other cryptocurrency projects like Ethereum or Stratis which are more of a development platform.
Dash advocates itself as peer-to-peer decentralized electronic cash. It intends to be as liquid as real cash which we use in our respective countries like USD/GBP/EUR/INR or CNY.
Dash is built upon Bitcoin’s core code with the addition of new features (such as privacy and quick transactions). Thank you

Currently, a lot of alt coins are profitable than bitcoin due to its swift instability (downswing).
All these factors affect its popularity ?? Do you think Bitcoin still has the mass interest and a lot of popularity?

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Bitcoin popularity is still speeding and has not drop,rether it's increasing everyday. There are alot of in interest on bitcoin and block chaoin technology.; and this is the one of the reasons why there are many ICOs currently on-going and we are expecting new more to com. I know there are pump and dump ICOs but there are also genuine one out there, and whether pump and dump ICOs or genuine ICOs, these has immensely increase the awareness of bitcoins and altcoins generally .

Yes it's sometimes look like is gonna end but fortunately it's always bounce back and even stronger. This is a common situation  in crypto world but i think cryptocurrency has come to stay and this is the future of money in my own opinion.

I am thinking is a may be situation for Neo. The reason is basically the Chinese government attitude towards Cryptocurrency development plus ICOs. However, the situation might change in the future and Neo plus other coins around that region may be successful.