I don't think they are dead. And it seems most people here agree. Many people on this thread have cited the huge number of 'me too' offerings. I think now that the market is saturated in relation to the number of traders only those with better tech or useful ways of presenting information will rise to the top.
For instance all crypto-exchanges are long lists of currency pairings and traders have to search through these piles to find what they are interested in trading.
Panxora.io lets traders customise their trading pairs in watchlists so you can be more efficient. You can have multiple watch lists or just one. This gives HFT or intraday traders maximum efficiency as they can arrange their trade desk exactly as they want it and save it to return to next time.