I think if it is a name brand dress then it is worth cleaning. Not preserving though.
Why:
Even if you keep moving it around it will eventually disintegrate and be beyond any hope.
What if it all came out and was beautiful? You could sell it for a couple hundred bucks with the statement >Freshly dry cleaned and ready to be worn.
It could be donated to a thrift store or to a clothing room so someone in real need could have something beautiful to wear.
You could even rent it out with the understanding they must bring it back cleaned.
I bought an old, really dirty looking and out of date, wedding dress to make a cancan for my granddaughters formal. It was only $10. The dress went in the fabric tub and I have more underskirt if I ever need to make another one.
There are many things to do with it besides just tossing it in the trash. I would think about it a little longer until I was very sure.
Asking a professional dry cleaner about the stains and if the beads and sequins will make it through the chemicals would not cost anything but a few minutes.
Some wedding dresses are made with beading and stuff that says do not dry clean on the package labels. Some people who design and sew these dresses don't think about that when they put them on these expensive dresses.