(Aside from "No guessing game, thanks": )
I'm one of the guys who are positive to such an inclusion (due to an extensive MOBA background - I find it a really interesting game to watch due to it having become its own thing separate from its "father" the original Dota and its "sibling" Dota 2), so my thoughts are going to be a bit biased. That said:
* I don't think LoL's a massive frontrunner - it's historically not affilitrated with Nintendo, and Riot's expansion into consoles - including the Switch - only happened recently. But that doesn't mean it doesn't have a shot. It's been borderline Minecraft-levels of popular throughout major parts of the globe for at least the last 5 years (as well as a pretty good presence in Japan) and has been in the spotlight for the last decade. Its association with E-Sports is not the only claim to fame, but very much worth noting. Not just due to LoL's extremely strong E-Sports push, but also since quite a few LoL teams have later on picked up and sponsored competitive Smash players - giving those two scenes a very much indirect, but notable connection. It also has quite a few gameplay elements that could work very well when adapted to Smash.
* While I don't have extensive knowledge of LoL's characters (I leave that up to
3BitSaurus
) which character would be chosen will have a decent impact on how much I enjoy him / her due to their different gameplay styles. As someone who leans towards Smash's more competitive side, I tend to look at that primarily. I'm leaning towards LoL's resident
Kitsune Kumiho Ahri because she could bring an interesting combination of pure burst and non-standard lockdown, but I wouldn't mind most other champions really. It would also be interesting to see how the Summoners' Spells (additional spells that players pick before a match) are handled.
* When it comes to Riot's owner Tencent... not sure what to feel honestly. And I'm the guy who has followed what they're up to perhaps the most here. Now, I'm not going to get into geopolitics much here - I'm not keen on derailing the thread. Still though, they are in a rare situation where they're distributing Nintendo's own consoles and games, and Nintendo gives them quite a lot of free reign within the distribution area. Also, I've literally called Tencent "Chinese Facebook" for a major reason: Tencent also started out as (and still primarily is) a social media corp - having pretty much woven their mobile games and social networks into one cohesive system - and
Furukawa aknowledged that in April 2019 (with the Switch officially releasing there December 2019):
Thing is, Nintendo's collaborations with them are also recent - the earliest possible date is 2017, when Tencent ported their mobile LoL Arena of Valor to the Switch. While talks of distributing the Switch in Mainland China probably got going in 2018, as evidenced by a
trademark filing that was filed in November 2018, any possible talks of LoL in Smash would probably have to be already taking place by then given the FP2 deadline. It's a short time window.