Ability to earn past Hype Train Emotes + the supper high level emote suggestion
Ok, most ppl don't participate much in these hype trains cause they might already have all the emotes for the current hype train event drops. My two suggestion is this, if you currently have all the hype train emotes that you can earn, then you should be eligible for a random past hype train/emote that you might of missed out on. This way, those that might of missed out on an emote would be more incline to help out with a hype train and be able to get some sort of drop from participating in one.
My other suggestion is this hype train level 10+ emotes, say you get into a hype train and it makes it to level 106, but you don't have the lvl 100 or level 50 emote, then you should be able unlock all the other lower special level hype train emotes as well.