I don't have too much of an issue with "new fans", we've all been new fans at some point, but I still cringe when I remember interviews with the crowd outside their ground when they clinched the title, half the feckers they interviewed were outside the stadium partying despite never having set foot inside the stadium, for others who'd managed to attend tickets for their title celebration match it woudl be their first live football match. Ever.
I have family who live in Leicester, so I do feel a slight affinity to them to be fair, but you're right, when they come back down, half the ground will be empty. A bit like the CCS was tbf