No actually she shouldn’t have high uptime broken mobility that makes hitscan nearly mandatory to kill her… not while having 0 downsides
She has great healing and damage and speed boost as well. Being untouchable for half the roster ain’t allowed.
If she’s too weak, they can consider other buffs, but we all know Juno is nowhere near weak. Perhaps not meta, but far from weak.
If she got a buff despite that (she shouldn’t), they COULD buff her falloff since it is now a lot riskier to play up close, and her falloff is not very generous at all about that. This of course is removing a large bit of skill expression (using all that generous mobility to stay in an optimal range- close enough to be effective, not so close you die), BUT her gun is aim intensive enough I feel they could be more lax about her range. Like 5 more meters.
For those asking for her easy team fight win free ultimator laser beam 2000- no 
It’s literally one of the best ults in the game even after the nerfs. And it takes practically 0 skill or effort to use.