Originally Posted by
antoniob
Does this mean that if I don't spend my miles by January 2018, I am going to lose them?
Not necessarily.
The current programme has already been extended several times. Given that Alitalia's future looks secure until April 2018, it is almost certain that the programme will be extended again.
That said - it is rarely a good idea to leave mileage balances festering - in ANY programme - for too long. You would be advised to spend the miles ASAP if you can find a good use for them, rather than letting them lie there.