Too much ICO will also cause a bad effect to Bitcoin price, which also will cause to alts and that ICO itself, and coupled with outside influences such as bad news from the people who hates crypto so much. if this continues, the price of bitcoin will be difficult to reach the ATH point like last year
I don't think it is because of too much ICO that bitcoin price drops. It is just normal for the bitcoin price to go down because there are traders who and buy and sell the coins. They saw a formation of head and shoulder days ago that's why the price went down. Traders speculated the price to go down because of that formation and then others who are waiting for the price to go up are furious because it went down again. If you wanted to take advantage of the opportunity of swinging prices then better learn trading.
As for other coins being not listed, there are different ways of being listed whether it is by payment or by community votes so if the team behind the coin would spend an effort in getting listed then they can do it. They may be just busy developing the project for now and just focus on it so that when their workload is getting lesser, they would have time negotiating in exchanges.