sorry to say but this is just a funny or silly question. 
as the day by day the people r diverting on on line purchase & sell & even the users r getting increase for using mobile phone or smart phones & internet, its a silly question.
for me the Bitcoin's future is excellent. its not easy to delete any currency when its not physical except some miracle happened otherwise Bitcoin will be in use till humans will keep using internet for business &/or playing various on line games or casinos.
i request u to buy & use them then u can understand why its future is excellent. sometimes self experience teaches more than theoretical methods.
so just chill & don't fear. enjoy mining 

BTC is an investment. its same like equities i mean share market. if u r investing in equities, u know this easily. u have to just know how it works & how its price goes up & down & by that u can trade with it.
buy & sell is the best thing to get more benefit from it but for that u have to find a secure place where u can do this easily & safely otherwise it may possible that instead of getting benefit, u lost whatever u have invested.
so its better to understand about Bitcoins & how it works then invest. that is why i told its same like equities. without knowledge any investment can make u looser. so get knowledge, gather information, think & then invest. proper knowledge & timing can give u good returns.

Bitcoin is not a physical currency. Its virtual & anyone can buy it but for that purchaser has to provide his bank details so those who had invested in Bitcoins from India for converting their Black Money, they all will be charged for their this transaction.
now a days Indian Government wants to close black money hoarders & by this big transaction, they all will be charge because they couldn't confirm why they had purchased these much of Bitcoins except they have settled their business or products by accepting or they r dealing with Bitcoins already.
in my opinion, they who had invested in Bitcoins by their black money will effect Bitcoins reputation in India when the Government find that they have converted their black money in to Bitcoins. Otherwise, as Indian Governments vision to make cashless or digital India definitely Bitcoins future was bright in India.
cash crisis can't be solved by purchasing Bitcoins because when the bank doesn't have enough cash to fulfill daily requirement then how they who had invested in Bitcoins can get the benefit of it. Even when Bitcoins will be en cash in the bank account they have to prove how they got that money from outside of India because almost all the bank accounts r linked with Income Tax department.
even if media can get this news about Bitcoins & we read it, Government officials also came to this conclusion & will target them who purchased & how much because its a transparent deal.
so it became useless to invest in Bitcoins on this higher price who bought them in India.       

There is a big difference between Bitcoin & real money & that difference makes Bitcoin an important currency. i m giving u an example for that.
u r going to buy something from web & they r asking u for the money. U will pay for that also but that person or merchant will get that money in his account after the bank charge. Bank normally charges 1.5% to 2% for that transaction if it is in Dollars from both sides but if u r paying in Dollars & that merchant receives in other currency in his account he has to pay the charge & the difference of the currency. Like u pay in Dollars & that merchant sales in Euro or Pound. u have to pay conversation charge & even that merchant also has to pay the same.
But in Bitcoin there is no charge for that conversion Because both side the currency is same.
so neither u nor that merchant has to pay extra amount for that. I can say this because many times i have paid this conversation charges & it costs a lot to me. almost 10% of my pay goes to bank.
Now a days many companies & websites accept Bitcoin as currency for on line transactions & their main reason this only. No matter in which country u live or whatever is your currency & their conversion ratio or conversion charge. u have to just pay whatever amount they charge in Bitcoin & pay. That's all. Its as simple & easy as u do transaction with your local merchant or trader. Even nobody has to pay any big charge to the bank for the conversation real money to Bitcoin & Bitcoin to real money.
For me its more easy than it. even u can buy Bitcoins from your linked bank account from your mobile & same u can en cash also. U have to just give a try for the first time then u will enjoy it.
I think all of your questions I have answered.