I don't think so because if a coin fails it's Telegram could still be huge even though it's irrelevant.
Telegram is very useful in every ICO because they could instantly answer all informations that will need by the investors. If the ICO could not immediately reply to the investors inquiries then for sure they will lost interest of the projects and force to shift to the other investment. If the coins failed that is because maybe their product is not feasible to the masses but with the agility of telegram they should easily to adjust of what is need to be done to avoid failure.