Obviously any time you're dealing with massive media consolidation there's going to impacts to the industry, trades, audiences, economy, politics, etc. I won't attempt to tackle any of that, but I thought I'd offer some thoughts directly impacting home video enthusiasts.
General:
Good: Paramount regularly produces new releases and catalog upgrades for home video.
Physical Media:
Good: Paramount directly produces and distributes titles on DVD, Blu-ray, and 4K UHD Blu-ray.
Good: Paramount widely licenses titles to boutique labels for Blu-ray and 4K UHD Blu-ray.
Digital Media:
Good: Paramount has their own digital streaming service to host internally produced content.
Good: Paramount licenses titles to a range of external digital streaming services.
Good: Paramount supports digital sales and rentals of its titles.
(VERY) Good: Paramount (uniquely) retains digital distribution rights of titles licensed to boutique labels.
Bad: Paramount is not a member of Movies Anywhere.
???: Paramount removed a range of 3D titles from Apple's TV App in Canada, this may have included purchased titles.*
I'm sure you can imagine what an alternate listing of Netflix could look like, with Red dominating the list. Does this mean that Paramount buying Warner is a good thing? Again, that's too big a question. Does Paramount buying Warner significantly impact the home video enthusiast? No, it should not. We should be able to continue to enjoy our hobby, including Warner titles, and there may be some opportunities for improvement.
Things I'll be keeping an eye on:
Will Paramount release/restore titles buried or hidden by Warner under Zaslav?
I'd love to see Raised by Wolves (and other "offloaded" titles) return to HBO, Paramount+, and/or digital sale.
Will Paramount pull Warner out of Movies Anywhere or choose to join Movies Anywhere?
Of the six major studios, MA current has three. Paramount/Warner will straddle the divide and could trigger a tipping point for the service.
Will Paramount's digital release strategy for licensed titles extend to future Warner boutique labels?
Imagine if the recent flood of new (and announced) licensed WB titles appeared digitally: Excalibur 4K, Cloud Atlas 4K, etc. (I'm not suggesting this could happen; those contracts are written, signed, and executed. I'm speculating on future deals after the acquisition.)
Will Paramount leverage or eliminate the (MOD) Warner Archive label/service?
*3D versions of Paramount titles added for viewing on the Apple Vision Pro are no longer available to buy/rent. One post and one comment state that purchased titles were removed from libraries. If true, this is a significant violation of expectations, particularly with Apple, and the minimal reporting is a reason for both caution and concern.