Whilst I personally don't think the Company will sack strikers, the maths for doing it is pretty startling.
2000 crew sacked on day 1. Total cost with a maximum £20k payout each, £40m (in 18 months time). That looks cheap to me if the alternative is a long drawn out strike costing £100m a week.
As I say, I don't think they'll do it - it would look appalling in the press and I cant think of an example when its been done, but I've now done 4 LH sectors since imposition and heard no gripes from the crews at all. Whether the desire to risk all still exists when you are due to report on day 1 of any IA is the biggie.