Until we have viable third party candidates that get equal airtime and invited to debate, it's not going to affect our current system.
No, this isn't how it works.
You will never have third party candidates in the American presidential system. It cannot happen. Ultimately, you always will have to chose between one candidate from the two parties. Any third party that gets big enough to challenge for the presidency will replace one of the two main parties. It's how the system works.
It's not to do with airtime and debates at all. If a third party candidate from the left or right grew big, it just guarantees the party of the other side wins.
The only way to have more than two candidates to choose from at the presidential level is to fundamentally change how the USA votes and chooses its leader. That is basically impossible (would require a constitutional amendment), but if you want that you need to be joining one of the two parties, getting involved at a heavy level, and changing the party platform.
The reason you don't have third party candidates isn't because of some nefarious plot between the two main parties (although they don't help) - it's just how a first past the post, winner takes all presidential system works with the electoral college. Debates and airtime won't change anything at all - ultimately, you only ever have a choice of two.