I bet it will be in the range of $3000 to $4000.
Php50,000 = $1250 won't be the price to long for as this won't happen.
The Sony 55" 4K is already sub-$5K so my guesstimate would be 3 to 4 Gs.
4K is currently the hype so it won't come cheap, as other tech goes.
Remember when 55" Samsung LEDs cost php200,000?