Unfortunately until such times as NATS and other ANSPs, and indeed the entire aviation sector, work out exactly what the future potentially holds then there is going to be uncertainty and demotivation. Our colleagues in the airlines have taken the brunt of this but ATC will also face its own challenges purely based on logistics of fewer flights and perhaps fewer airports.
As far as I know, NATS are not looking at a reduction in operational staff - not yet anyway. The quandary for those affected is jump now with a substantial amount of cash or wait and take a chance. Downside is they get pushed next May with a stat redundancy package. Maybe NATS have played this well for that very reason? Use the fear factor to get as many as possible away asap! There may also be some disgruntled operational staff who would happily go now under NATSAG01 but haven't been offered, yet may get forced out next year under the new package. All in all it makes for an unsettled workplace and unhappy workers.
Last I had heard there were other options on the table to save cash. Sabbaticals and part time working, enhanced retirement package and a few others. Surely it would make sense to reduce the pay total but still have personnel available for the upturn. Once someone is gone then the savings may be there but the replacement is not so simple.