That's and great and all, but
[insert rain clouds]
Something like from Democrats as the minority party isn't that surprising, given the events of the past 6 years, and the further liberalization of the party. What would be surprising is if this got enough to support to pass the House during a period of unified Democratic control with 60+ Democratic Senators.
Otherwise it's really just meaningless imo. What would be surprising would be many dozens of Republican co-sponsors as well.
But it does have a importance this is an early sign the dems might embrace "Medicare for all" as the 2018 "contract with America"