Lets just agree, whilst it may be baby steps, things are looking a bit better for airline diversity in STN.
In 2019 EZY had around 10% share of STN passenger traffic, whereas now they're 3-4% at most. The previous 6-7% they held has principally been distributed to some Jet2 growth and to "others", with Ryanair maintaining a broadly similar share. So in effect there's a slightly better mix in the traffic that sits alongside the core Ryanair operation.
O'Leary said in his recent press event (where he spent most of it slating Rachel Reeves) that given STN's expansion plans, he could see them growing to around 30mppa (from around 21mppa currently) subject to a low-cost commercial agreement and APD. If we assume that's at the point where the current 43mppa cap is reached, that would still give them no more than a 70% share which is slightly lower than it is now. I imagine MAG will be keen to still allow Ryanair some significant growth as part of their expansion plans, but not to take an even bigger piece of the pie.