I think for me, cryptocurrency problems that will be facing are those ICO projects that keep increasing every month and every year and most of these projects are shitcoins that was created to scam people and by that the reputation of crypto is decreasing so it means the market is affcted too.
If ICO projects increasing everyday i think that would be fine but indeed the biggest effect from large number of ICO is the number of scam projects also increasing too and these things will makes cryptocurrency face looks bad especially for those who hate crypto that they will makes these issue to advice people to stay away from crypto and this is not good for cryptocurrency development