If there are indeed going to be lower passenger numbers for a few years, one wonders whether they could attempt to 'reset' the national timetable to that of a previous year, 15-odd years ago (with some tweaks to account for re-opened lines, electrifications, etc), when presumably less trains were running overall, but there were even-interval patterns rather than the messy 'timetables with holes' that we have at the moment?
Not saying this would work, just floating it as an idea.
If we're going to have reduced timetables for many years, we need even-interval reduced timetables. An even-interval half-hourly service, for example, is better than two of the three trains per hour of a 20-min service, with a 40-min gap.