Will overwatch spread to other gaming systems?

I really love overwatch but it’s only available for the 3 main gaming systems like Xbox, pc and ps4. I currently only play on Xbox but I’ve been thinking to move to the Nintendo switch to play the legend of Zelda botw, Odyssey, the new smash and others. The thing is that if I switch I really won’t be able to play overwatch so my question is... will overwatch ever expand to the Nintendo switch or perhaps even mobile phones!? I kinda got the idea of overwatch on mobile phones ever since I heard the fortnite announcement and it got me thinking cause fortnite is somewhat of a bigger game (in the space taking way) than overwatch and it’s apparently making its way to phones. If fortnite can then why can’t overwatch?