Personally I think since the entire game is being moved to a deathmatch fragfest that dps comps will reign supreme. So if I had to guess off tanks will be more popular. The only ones asking for an actual tank will be the few slow supports like Ana. Everyone else will be off doing their own thing without the need for a tank, or even really the option since only off tanks can keep up.
Edit: it’s also worth noting that since Blizz are changing tanks to just fat dps odds are some dps will move to the role and that demo is inherently more likely to select an offtank type hero.
If you dont like it now then you should be open to more changes
off tanks should not exist in ow2, and all tanks will be frontline brawlers rather than team protectors
you can track shatter then steer clear, you see this many many times already. You can literally go games without getting shattered w/ no shield.
Tbh Rein is less of the problem…
Now with one less tank, there’s less need to focus on tanks and more on dps and support. Which makes lives much easier for divers and snipers who usually fear much more from barriers.
Especially now with all the protection nerfs.
With divers and flankers seeing much more play you need something that can get value from the protection as much possible.
While we don’t know what Orisa will be reworked into, my current guess is that the most played tanks would be either Winston or Hammond.
When protection doesn’t mean a lot in the game, the scariest thing you can have is something that would be able to contribute as much damage possible and focus key targets.
Again, just a guess but -protection= damage is more important= dive tanks become much more important
The better question is who do you even make rein to compete with any other tank.
Keep buffing him for no reason all the time isn’t going to fix that.
Other than them and their team relying on superior movement/positioning/high ground, perhaps using their defensive ability could body block whatever’s behind them (ie TaB, adaptive shields, matrix, bubble) 
Well, balanicng won’t become worse. rn earth shatter is blockable. Then, we can assume it will be blockable as well.
Yeah this is one of the many issues that comes with 5v5. Not saying they can’t be fixed but some seem harder than others. A Rein with shatter will force teams to concede a lot of space in fear of getting rekt, Rein could even solo shatter the tank so that his whole team can nuke them and make it an easy 5v4. Roadhog has a huge advantage over Dva, what is Dva going to do against hook? Zarya has advantage over Roadhog because she can negate hook with bubbles, etc. There are many interactions between tanks that are problematic with solo tanks, I wonder how they will fix them.
I think the most likely solution will be to reduce shatter’s stun duration.
We’ll have to wait and find out though.
I would guess that the width would be greatly reduced so every shatter isn’t a team wipe.
No tank, or character, in the game can block Sigma’s ultimate either. What’s your point?