Let's go for 5k$ as it sounds pretty realistic (outside bubbles).
Biggest threats will come from Ethereum or better cryptocurrencies that will scale faster compared to Bitcoin and all its forking drama.
Invest moderately, no need to rush.
I don't think so. Maybe Bitcoin will be 1k.
I think that because you never know what can happen.
Maybe there will be another coin that's more valuable. The future is always unexpectedly.
If the user amount increased from 1 million to 10 million, the price will increase 100 times. So it will be 100*400= $40,000.
I dont think that will happen, you can't control the future but I dont think its possible.
The bitcoin wil rise but not with to 40k its just to much, its very unstable nowadays.
The future of bitcoin is good but so good, no I dont think so it will be at 10k max.
I don't think the value would reach 10000$ by the year 2020. The price may reach up to a range of 5000$ to 6000$.
The bitcoins growth is not continuous, so according to the calculation it won't even touch the 5000$ which I've quoted.