In short the answer to the original question I'd say is no.
You only need to look elsewhere, the US particularly, to see that consolidation is the way the industry has been heading for some time. Europe has actually been a bit behind the curve on that trend, no doubt driven by individual member states still each having their own national/legacy carriers, irrespective of their ownership structure. But even then there's been a lot of consolidation through IAG, Lufthansa Group, Air France/KLM... even Ryanair have joined the club with Lauda, Buzz etc.
Any new airline that would appear in the UK or Europe would almost certainly be from some sort of reform of one of those current big airline groups, and not a seperate newly founded airline. Covid-19 has and will just accelerate shaking the weaker players out as was already the natural course anyway.