The most obvious problem is space. Most of my roths (400 or so) are between 1-8 years old with about half around 5 years. I find roths the easiest paph to grow and hardly ever lose any.
I have a 6m x 3m greenhouse that is jammed with plants so currently building a second slightly bigger one to house just multis.
I have taken all the flowering roths out to catalog (measure and photograph) and will now remove all the spikes. This will also give me room to reorganise the greenhouse while I have some spare time (we are in Covid lockdown)