Not really sure how they'l deal with the fact that people will claim that ETH tokens weren't for mere profits based on speculation but rather for payment on the platform. Could it be a possible that it might just end up being a formality or maybe they'll trace the tokens that have been used before a certain deadline?

Although the decentralized apps might the ones most worried but as you said that because without a previous precedent their is no justifiable way to deal with the situation. Maybe Ethereum will get a pass up till now and then 'line the sand' would be drawn.