The behaviour and timing of the decision to essentially withdraw Wizz UK operations from Doncaster is both reprehensible and cynical in equal measure. Cynical as this weekend in UK is exactly the right time to "bury bad news" when the media is totally preoccupied with a certain celebration; reprehensible since 7 days is hardly reasonable notice to give; had they announced the base would close in, say 4 weeks, that would at least hive given the passengers unfortunate enough to have paid them good money a chance to make alternative arrangements. I would suggest that the airport management at Cardiff may be worrying more than a little presently.
Given their behaviour I would counsel anyone thinking of doing so from booking Wizz flights unless it were to be 24 / 48 hours ahead of the departure date since they are obviously totally untrustworthy as a business, and frankly make Ryanair and Michael O'Leary appear corporate and personal saints respectively in comparison.