I don’t think any other blockchain can rival the quality and quantity of projects that are currently being built on the Ethereum platform.
Is it possible that we’ll see new projects springing up on other platforms? Most likely.
However as it stands today, Ethereum is years ahead of the competition because of its ecosystem and community. The only way such platforms gain in popularity and market penetration, is by having active and robust developer network. Again, this is a critical paradigm, where Ethereum stands out compared to other solutions.
Until we start seeing a lot more development happening on other blockchains Ethereum is going to lead the way. It may not be the best or fastest technology on paper, but it does have a lot of backing and momentum.