It all depends on when you want to travel and if you will take whatever is available no matter room size,
Summer you might find things still there for SSR Or OKW, including studios,
The rest of the year will be difficult, especially at near park resorts. Nothing is ever impossible, but you might find is you would need to solit stay a few times, take 1 or 2 bedrooms for some nights, etc,
In the next few years, it will be even harder as there are now e tea points in the system due to the closure.
But I have gotten 1 night in a BWV 1 bedroom day of in March, and did get 2 nights in an SSR studio last July with only one days notice.
However, any other time I have tried to book 3 months out, especially for January to March, I could not string more than two nights together.