Besides, Microsoft has enough PR skills to avoid unpleasant announcements about redundant products for a while after an acquisition they know to be worrying.
Quite common for new owners to let old employees make promises they can’t keep and then make them disappear and change plans.
Not saying that Microsoft has a plan to 'embrace extend extinguish', but if they did, this is how they would go about it.
Until they aren't. I really don't see MS putting work into two code editors that are in direct competition with each other. I'm sure they'll let the dust settle for a while, but Atom will vanish from Microsoft's product list. No doubt.
Then... who knows.