Well, that won’t be happening in the Pro-V lines anytime soon. It took years to get yellow released that performed as well as the white balls. Besides limited demand among Pro-V users, not likely it would increase market share.
Unlike tennis, even yellow golf balls have not gained wide acceptance. Based on postings, there is more interest in a couple of variants in the Pro-V lines than more colors.

It was several years before the ProV1 and ProV1x were optional yellow due to demand and impact to the production line to create multiple options. Unfortunately I believe you will be in the minority for wanting orange and it would not be economically viable for Titleist. Never say never but until then, enjoy the yellow versions.

I’m worn out from wishing, praying, and pleading for the yellow. Thankful for them and enjoying them immensely.

Probably wont happen.... But I did dye 2 dozen practice ProV1's orange. Worked well and made it easy to identify which balls were mine in the practice area. Used Rit Dye!

The only ball that Titleist makes in orange is the Velocity. A true distance ball at an affordable price.