No…the reason is because she’s, you know, statistically balanced, has fallen in and out of viability on her own without changes for over a year, and has 0 Pros complaining about her. Well there was the time Samito tried to call her OP and Jake and Danteh publicly laughed at him, I remember that 
In fact, lots of heroes who ARE getting reworked in OW2 have already seem some sort of iteration or version of that either on experimental or even the April Fool’s patch. Some have even been already added to the game, albeit at a smaller level, such as Rein’s charge change, and several of the tank changes, Soldier’s gun change, Tank Mei, Dva’s mech buff, etc. So doesn’t really seem like the Devs are shying away from that.
The ONE time she COULD have seen changes was during the Mercy Zen damage boost meta months ago when the forums were rlly complaining about damage amp. But, as I said then, and as all the Pros said, Zen discord was the issue, and that’s why only he got nerfed. And just like that, the meta went away. Crazy how that works.
And I wouldn’t be so sure about changes to her kit in OW2, considering she’s one of around 3 heroes we saw full talent trees for at this past Blizzcon. You know, the part of the video that showed they already had like 56 talents built around Mercy’s current kit. I don’t think they’d invest time into that for a hero they were planning on fundamentally reworking. Doesn’t seem very smart, and Blizz already said that multiple heroes wouldn’t be shown during the PvP demo because they were getting reworked - Mercy wasn’t amongst those. She was also never mentioned when they discussed the several specific heroes they are reworking. Hmmmm.
As I already said, your chance was months ago during the damage boost meta when she had a much higher pickrate than she does right now and the whole community was crying. But Zen discord got nerfed bc it was the issue. 
Right now her pickrate is the same as Ana’s and less than Bap’s. It’s a bit above Lucio and Brig who both have great pickrates too. The support diversity atm is something the Devs are probably celebrating, not freaking out over, rofl. I’m sure they are more worried about the rise of Orisa comps.
I am looking forward to Overwatch 2, I hope it launches around Christmas