Quote from Jason Rogers:
I think it's too hasty to speak of an end to MT4 in general as so many traders use expert advisors on it. I think a more plausible scenario is traders moving from US brokers to overseas brokers that use MT4 so that expert advisors will continue to work without interruption.
Plus Metaquotes from a business perspective has an interest in continuing MT4 otherwise they stand to lose out on the money they're making from licensing MT4 to those brokers.
How does metaquotes make money if they sell the platform to these brokers in one shot. That is why they are coming out with an MT5 something new to sell to these brokers. I heard that an mt4 platform costs more than 60k and just imagine what an mt5 will cost.