the token will continue to exist as long as the ico of the project continues to run and the token is just an alternative to bitcoin and tetep being altcoin and will not be able to replace bitcoin. so people can choose bitcoin or altcoin as an investment and others.
Token is the reward that we get from the bounty campaign and it also exit as long as their are bounty campaigns and different kinds of ICO. Token is the alternative bitcoin that is rewarded in bounty campaign.
Well same goes with a lot of new products outside crypto. Tokens are promotions to draw interest anf support from would be users and investors since a lot of people like freebies.