Nah, there's too low of a subscriber ceiling for ad-free subscription video. Lots of households will spend less money in exchange for having to watch a reasonable amount of ads. That's why Netflix, who built their brand on ad-free on-demand streaming, eventually reversed course and began offering a cheaper ad-supported plan. And now Prime Video has followed suit. Broadcast and basic cable were built on ad revenue and whatever is going to replace them will have to be built on it too.Or just have no ads and charge a flat rate for everything.
For HBO, which is a premium product aimed at more upscale tastes and has always had a higher price per hour of content offered, it makes sense to always be ad-free. (It's odd and, I think harmful to the brand, that Max is now putting ads in HBO Originals on their $9.99/mo ad-supported tier.)