If Sky Disney vanishes from Sky Movies and isn’t available in any form that will be a massive blow to Sky, they certainly couldn’t keep charging what they do for Sky Movies and the service will be rather baron... Disney+ already makes Sky look significantly less appealing.
To be pedantic Sky "Movies" doesn't exist anymore. You obviously mean Sky Cinema
Note that Sky Cinema does not purely consist of what goes out on the channels. You get the on-demand offerings too, the "enhanced" picture quality ("increased by a third over regular HD. The number of colour shades is multiplied by 4 too."), HD as standard and 4k on Sky Q. Also the "original films", but ones mileage tend to vary with these.
And price wise, well anybody who pays attention to these things doesn't pay full price for Sky Cinema anyway. Whether you think its worth £19 a month on top of your Entertainment pack is a decision for you.