The price of bitcoin begin to rise in mid-year and because of the huge increase last year it ain't possible that before the 2018 ends bitcoin will be $20 000 again. In fact, the price could be bigger than that because many establishments and businesses are planning to add bitcoin as payment method.
Honestly it is not impossible for bitcoin to surpass the expected price of $20 000 because as long as many people uses and the demand increases, the price will grow as well.
Business would support Bitcoin if it was more capable basically, thats the current problem. Its possible BTC got too far ahead of itself relative to actual trade done. The very obvious drawback to excessive transaction fees is the usage is not expanding at the rate the price can justify, its overblown.
20,000 is easily surpassed if they solve the negatives that are holding back BTC. A obvious point to that gain would be the fall in value for US Dollar over the last year, this is the worlds reserve currency held by billions of people.
If only a small amount of those holders seek alternatives such as Bitcoin then we can see double the ATH of 20,000. Confidence counts considerably and so far BTC has not done itself any favours by restricting the spread of bitcoin by common population.
Speculators and big business is not enough to drive the price, those people are not the backbone to higher pric. The worlds largest companies revolve around the simple sale of such things as a can of Coke and that level of commerce needs to be done in BTC. If bitcoin wont handle it then another crypto will break through and take the trade away.