I think that the prices of bitcoin need a strategy from investors and traders & devlopers & companie
for example: - like mid 2017 When top exchanges imposed very strong restrictions to all deposit.
- creat special box loan fund (1 - 10 percent profit after 6 month & 0.01 percent profit after 1 month in top and trust exchange like binance , bitfinex , bittrex ) and that will encourage investor for holding their bitcoin with profit( imagine if people invest about 1000000 btc for 6 moth and they can't desactive investement before 6 month.that can make price in stability and bitcoin will gain time to 2020 and circulation of bitcoin will drop little)
- max sell in exchange is 1 bitcoin per day , without multiple acount (this is good way!) , there is no max buy
-dont allow mtgox and whale to sell their bitcoin in exchange.
- exchange print tusd and usdt (loan bank )
exchanges won't collude to prop the price up. they have incentive to undercut one another to generate more trading commissions. if one exchange limits the amount of selling, others will step in to take their business.
even if exchanges were willing to engage in this behavior, a gap would just develop between "the real price" (which buyers pay OTC and p2p) and "the fake price" listed on exchanges because they won't allow sellers into the market.
if sellers can't liquidate on exchanges, they will liquidate OTC/p2p and that will pressure the global price lower.