Already is, to a point.
If they want me back, they need to simplify the small items (none of this tiny increments 100g, 250g, 500g, etc) & be more competitive on the parcels. I would rather use them, as Evri are proving a nightmare (throwing parcels marked fragile in the customer’s garden is one example), but the cost, simplicity of pricing and the strikes keep me using them. Except, at times, for surcharge areas.
If Evri got a grip of their quality of service, I would stick with them. Even with the surcharge - sometimes still cheaper than RM.
But I do think there should be a level playing field. If you want to do, say under 5kg, then you must cover all the UK for the same price. Maybe even have to do letters & LLs.