Capacity has now been removed from the market which is good for those that remain as prices will rise (ignore impact on consumers) and assist proitability. There has been a lot of over capacity so likely only 60-70% max of what is lost will get replaced.
Bearing in mind if Brexit happens and GBP v Euro falls even further then potentially will remove customers from the market for at least summer 2020 as it is just too uncertain. A lot of airlines will be crunching the numbers and some may decide not to add on any capacity if it cannot be profitable.