If there's a possibility that the best run club runs the risk of being kicked out of the SL because they have a horror run with injuries then the system is broken.
No if's or but's. P&R or yearly franchising will not strengthen the game in the UK.
They will be in SL 1 at the start of the year. If they are good enough they will be in SL1 at the start of the next year.
It's just a bit like saying if a top club has a run of injuries at the moment and doesn't make the playoffs then the system is broken.