I think everyone is sleeping on a Fortnite rep. Nintendo is a company that wants to maximise its profit & advertise its games & develop good relationships with 3rd parties, they rarely listen to fan demand, in FP1 only Banjo was included due to sheer fan demand. Whereas, we’ve had Byleth, Min Min & Pyra/Mythra to advertise their games on the switch. Also, Nintendo kept asking Sakurai to include Steve due to how lucrative Minecraft is & I’m wholly expecting the same thing with Fortnite, sadly.
I mean I don't know if Fortnite was being slept on. we had a period where they were heavily talked about
Anyway I don't think it's that simple. Remember that Nintendo has to talk to Epic games to have Fortnite in Smash, and that Might requires alot of time, and potentially alot of Money. Nintendo will have had to judge whether they could get a Fortnite character in Smash in time for FP2, and also how money is gonna go into implementing Fortnite in Smash, as well as balancing that with other characters in FP2, including Steve
So I'm not entirely sure if putting Fortnite in FP2 would be maximizing the profit that Nintendo is making. Especially this late into the pass and with how even with a game like Smash, less and less people buy into the game as time goes on, in terms of retention rate. However Fortnite is a big game and Smash X Fortnite would be a big deal, even if it will get alot of hate from good amount of people, more than Minecraft, so Nintendo get alot of money from that perhaps
I do think Nintendo and Epic games did talk about Smash, and Perhaps they might have plans in the future, so even if not in FP2, I do think Fortnite will have some type of presence in Smash in the future, whether New game, or expansion or whatever.