Take Bytecoin right now. Their blockchain is over 9 gigs to download. How big will it be in 20 or 30 years? (assuming its still around). What solutions are going to be in place for people to download and store such a massive file?
Now pretend you have 20-30 different coins all with massive blockchains.
This is an inevitable consequence of blockchain technology and we can do nothing about it. But don't worry, the technology will catch up. So there's nothing to worry about.