Count the costs of a Strike:
1. Aircraft parked at airports everywhere.
2. Pax stranded at airports everywhere.
3. Travel plans down the toilet for future booked pax
4. Flight crews stuck at hotels (Other airlines would most likely assist in getting the crews back to their bases)
5. The unsightly picket lines at Airport Terminal buildings
6. Other employees of the airline temporarily laid off until strike over
...and on and on it would go. I'm not saying it's a never never, but a shutdown of the airline is fraught with short term and long term consequences, that's why both sides will do everything they can to get a deal.
Then there is the cost of starting up the airline after the strike, getting the aircraft re-positioned, crews back on-line, returning to a full schedule etc. It's a costly venture which will drain the company coffers big time. The downside also applies to the pilots, who will loose pay (unless they have a strike pay clause) etc.