The problem here is, now you are entirely dependent on medium.

Here’s a similar response about moving from WP to Medium >> https://medium.com/@ConversionChamp/comparing-wp-and-medium-isn-t-exactly-fair-unless-you-are-comparing-wordpress-com-fde86828d857#.hblpxsjne

Short-term, moving to medium will work. But once more people come to Medium and it gets saturated, you are going to find it difficult to attract audience.