I can't totally cross off the thought or possibility of cryptocurrency completely taking over fiat currencies. With a little recognition and participation, cryptocurrencies can go beyond what we think right now. Although, if I were to place a bet, I'll say that both types of currencies will work hand in hand.

Yes it is possible to make money from airdrops and yes it is worth the time and effort (most times)
It depends on the company. While some issues high amount of tokens, others offer very little. Unfortunately, you cannot ignore the scammers who also use that avenue alot. Though, I believe that the advantages outweighs the disadvantages

I think the best option is to keep it. You gain nothing by discarding it, rather, you lose.
If you decide to keep it, there is a little chance that the value will rise someday.
Personally, when I have such coins without value, I keep it and also keep my fingers crossed. Who knows?

On a personal note, I believe that bounty is more profitable than airdrop. The payment for bounty is much more higher than airdrops. Although bounty also requires much more work than airdrops.

I joined altcointalks initially to get a platform for doing bounty works. Recently I've come to find altcointalks much more educative than I ever imagined. I've learnt so much in a few weeks than I've done in years. Thanks to the person who referred me to this forum.
Why did you join altcointalks and what is your experience so far?

Thanks for the insight.
I've been looking for ways to gain more followers on Twitter
This is quite helpful. I'll try some of these methods you've pointed out.

Good point. It's a win_win situation for both parties. The Blockchain owners gain as their projects gains more popularity through the airdrop while the participants gain by earning tokens

Thanks for warning. A lot of people fall prey to these scammers. It seems like they find a new way to scam daily. Let's keep exposing them.