I dunno, we can opine about the Hell arc all we want, but it won't "quite" feel as potentially satisfying when and if it comes.
Part of this is because I'm content to leave the series as is, not have a Naruto/Dragon Ball situation where the universe is continuing but I've actively stopped feeling as invested. We already had the Christ analog and Ichigo run through many layers of plot armor to win. Unless the next enemy is literal Satan opposed to the next smug "u can't hit me" bad guy, I'm already getting tired at the idea.
Maybe Kubo can channel his energies into something more chill and low key? (I mean Burn the Witch but that's kinda an extension OF the Bleach world, is that still a thing or...)
But what of all the cool power-ups? Hell arc shenanigans with maybe the long dead Captains? Sounds cool on paper, but they're just ideas, no hard proof of anything happening. Definitely feel like the best time to strike or tease this kind of thing is DURING the new anime's run, where Bleach fan excitement and general interest is at a high.
Only Kubo knows I guess.