For sure it will stay for long time coz many people looking for it especially gamers, which is these days they keep increasing on the space.
So i wouldn't be surprised if however 5 years from now they are still alive and become more reliable as source of income as well since most of them are legit.
Not all gaming tokens can be legit and last up to five years from now because game lovers or gamers also look and choose carefully on all tokens because there are also gaming tokens that die by themselves due to the absence of enthusiasts in the market.