If PHP is likely to be upgraded then it should go to 5.6.11 direct so that upgrading problems for next 12 to 18 months won't be an issue. The latest php it is the better but I don't hold my breadth for this to happen in the near future.
Just continue using WordPress or find another webhost who has latest packages on their servers. 000webhost is on life support as far as I can see. A huge investment is required in terms of manpower and hardware.