that much in such a small period. If you look at the last years he didn't rises allot so don't be to happy about it.
it's not reasonable i think stable at $5000 is enough
$5k is impossible to achieve in next 4 years I guess, but if it reaches there then it will benefit all of us, but I think price would be around $2k in 2020.
$5k does look unlikely, but anything can happen, if you look at the year 2013, when the price of around $10 and nearing the end of the year the price reached $1300. anyone would never guess it could happen. but $2k it is very likely to be achieved.